Abstract
Objectives:
The purpose of this study is to report nine patients of young women who underwent a surgical treatment of an accessory and cavitated uterine mass (ACUM) in our hospital between 2014 and 2022 and review all cases described in the literature.
Material and methods:
The principal outcomes measured are the imaging techniques used to determine the diagnosis, the type of surgery used and the post-operative evolution of symptoms. We also report and analyse the 79 patients found in the literature since 1996 in addition to our 9 patients.
Results:
Surgical excision is the only long-lasting treatment. Small invasive surgery with laparoscopic access is the gold standard and most widely used (83.0%). Some new therapeutic procedures have been recently described of which ethanol sclerotherapy seems very promising. Post-operatively, 54.5% of patients have a complete relief of symptoms. MRI is the best imaging technique to identify ACUM. Finally, we refine the description of this pathology and give a more precise definition of it.
Conclusion:
Through our literature review and the analysis of our cases, we want to underline an important diagnostic criterion of this pathology: the fallopian tube on the homolateral side of the ACUM never communicates with the latter. It is a capital element for differential diagnosis.
1. Introduction
Accessory and cavitated uterine mass (ACUM) is a rare Müllerian duct anomaly of unknown incidence, which affects young women. Since its first description by Cullen in 1908 (1), different terminologies have been used to describe the same entity: juvenile or isolated cystic adenomyoma (2), uterus-like mass or accessory uterine cavity (3) and adenomyotic cyst or cystic adenomyosis (4). In 2010 Acién et al. (5) suggested the term accessory and cavitated uterine mass as a new terminology and defined it by the presence of a non-communicating accessory uterine mass located in the myometrium or within the broad ligament, close to the round ligament insertion, with an otherwise normal genital and urinary tract (3, 5). A list of the diagnostic criteria for ACUM as suggested by Acién et al. is presented in Table 1.
Table 1
| Diagnostic criteria for ACUM [as suggested by Acién et al. (5)] |
|---|
| (1) An isolated accessory cavitated mass |
| (2) Normal uterus (endometrial cavity), tubes and ovaries |
| (3) Surgical excised mass with pathological examination |
| (4) Accessory cavity lined by the endometrial epithelium with glands and stroma |
| (5) Chocolate-brown-coloured fluid content |
| (6) No adenomyosis (if the uterus removed), but there could be small foci of adenomyosis in the myometrium adjacent to the accessory cavity |
Diagnostic criteria for accessory and cavitated uterine mass.
While most clinical manifestations for ACUM are non-specific, dysmenorrhea, which ranges from mild to severe, is reported as being the most common symptom. It typically starts soon after menarche and rapidly increases in severity thereafter. Chronic pelvic pain (CPP) and dysfunctional uterine bleeding are also frequent.
ACUM symptoms, such as dysmenorrhea and CPP, are often primarily or secondarily resistant to common analgesics and to classical hormonal treatment as progestogen-only pill (POP), combined oral contraceptive pill (COC) or gonadotropin-releasing hormone agonist (GnRH agonist), as it is the case with endometriosis.
According to Acién and his group, this anomaly required a separate classification and definition from the ESHRE 2013 consensus on congenital malformations of the female genital tract (6) as it does not include this anomaly. At the time of writing, it is considered as part of the unclassified uterine malformations (U6 class).
In their opinion, the origin of this uterine anomaly could be caused by a gubernaculum dysfunction during the embryogenesis expressed through a duplication and persistence of the ductal Müllerian tissue at the attachment level of the round ligament (7).
Our study objectives are (i) to describe nine new patients that we operated, (ii) to do a literature review starting from 1996 and (iii) to analyse and describe this rare pathology as precisely as possible in order to help with the differential diagnosis.
2. Materials and methods
We report on nine patients with ACUM treated in Lausanne in Switzerland. All of the patients gave their written consent for the care provided. The study was retrospective, based on medical file analysis, and the standard treatment for this pathology was performed. The written informed consent was obtained from the individuals’ and minors’ legal guardian for the publication of any potentially identifiable images or data included in this article.
For histological analysis, specimens were fixed in 10% neutral-buffered formalin (6–72 h). Formalin-fixed paraffin-embedded samples from specimens were stained with haematoxylin and eosin (HE) (Ventana HE 600 system). Immunohistochemistry (IHC) was performed with an anti-CD10 (56C6, mouse monoclonal, Ventana) antibody using the Ventana BenchMark automated stainer and revealed by the ultraView DAB detection kit (ref. 760-500).
Our literature review aimed to identify all reported cases of this pathology. The following terms were used to search the Medline database using PubMed: juvenile cystic adenomyoma (JCA), uterus-like mass, accessory uterine cavity, adenomyotic cyst, cystic adenomyosis and ACUM. Only the cases corresponding to Acién et al.'s diagnostic criteria of ACUM (5) were included. We found a total of 79 patients between 1996 and April 2020 to which we add our 9 patients. All authors declare no conflict of interest.
3. Results
3.1. Nine case descriptions
Nine patients who presented with ACUM were operated in our clinic between 2014 and 2022. Their characteristics are described in Table 2. The average age at the time of surgery was 22 years (range 17–35 years).
Table 2
| Age | Age at menarche | Gestity (G)/parity (P) | Year of the operation | Medical/surgical background | Ethnicity | |
|---|---|---|---|---|---|---|
| Patient 1 | 23 | 13 | G1P0 | 2021 | Medical abortion | Caucasian |
| Patient 2 | 19 | 13 | G0P0 | 2022 | — | Caucasian |
| Patient 3 | 18 | 12 | G0P0 | 2014 | Hypermenorrhoea | Caucasian |
| Patient 4 | 22 | 13 | G1P0 | 2016 | Personality disorder, anxiety addiction to cannabis | Caucasian |
| Patient 5 | 35 | 14 | G0P0 | 2018 | — | Caucasian |
| Patient 6 | 18 | 12 | G0P0 | 2020 | — | Caucasian |
| Patient 7 | 30 | N/A | G0P0 | 2021 | — | Caucasian |
| Patient 8 | 17 | 12 | G0P0 | 2017 | Raynaud syndrome | Caucasian |
| Patient 9 | 18 | 12 | G0P0 | 2017 | — | Caucasian |
Characteristics of nine Swiss patients.
Severe dysmenorrhea (n = 5) and CPP (n = 4) were the most common presenting symptoms. As part of the clinical workup, the patients first underwent a pelvic ultrasound (Figure 1). A single lateralized intra-myometrial accessory cavity located under the insertion of the round ligament was found in all patients. The capsule of the lesion had the same echogenicity as the normal myometrium, and the content appeared as hypoechogenic.
Figure 1
In addition to an ultrasound, all patients in our series underwent an MRI in order to have a precise description of the lesion (Figure 2). The lesion always had the same characteristics: the mass was isolated and composed of an external thick ring which had the same signal intensity as the junctional zone and regular boundaries. Its contents had a spontaneously hyper-intense signal on T1, T1 fat sat and T2-weighted images speaking for a haemorrhagic material. The rest of the genital and urinary tract was normal across all nine patients.
Figure 2
The same laparoscopic resection technique was used by four surgeons on all patients (Figure 3). Eight were performed by standard laparoscopy, whereas one of them was performed by a robotic-assisted approach. For the standard laparoscopies, we did a four-trocar approach. The upper abdomen, ovaries and fallopian tubes were macroscopically unremarkable in every patient. The uteruses were deformed by a mass bulging into their anterior part under the insertion of the round ligament. An incision was performed over the swelling zone on the uterus in order to remove the lesion. The progressive dissection around the mass was difficult due to the absence of a correct dissection plan. The average operative time was 128 min (range 80–240 min). No uterine cavity was opened during the procedures. No intraoperative or post-operative complication occurred except for one patient where a fundal uterine perforation by the manipulator occurred. After surgery, the patients were discharged between day 1 and day 3. In all patients, microscopic examination showed a cystic cavity lined by thin endometrium lining and stroma (Figure 4). The myometrial capsule contained small adenomyotic foci. Complementary IHC analysis was performed in patient number 5 to help for diagnosis. Anatomopathology confirmed the initial diagnoses of ACUM in all nine patients.
Figure 3
Figure 4
The schematic representation of the location of an ACUM in the reproductive tract is shown in Figure 5 (created with BioRender.com).
Figure 5
3.2. Literature review
The characteristics of the 79 patients retrieved from the literature and our nine patients are presented in Table 3. The mean age at diagnosis is 21.9 years (range 14–39 years).
Table 3
| References | Number of cases | Age (year) | Major symptom | Investigations | Lesion location | Lesion size (cm) | Type of surgery | Diagnosis | Follow-up (month) |
|---|---|---|---|---|---|---|---|---|---|
| Tamura et al. (8) | 1 | 16 | Severe dysmenorrhea | TAUS | Left side of the uterus | 3 | Laparotomy | Adenomyotic cyst | Diminishing symptoms |
| MRI | |||||||||
| Pyelography | |||||||||
| Potter et al. (9) | 1 | 15 | Dysmenorrhea | TVUS | Left side of the uterus anterior to the round ligament | 4 | Laparotomy | Non-communicating accessory uterine cavity | Symptoms disappeared (12 m) |
| Pyelography | |||||||||
| HSG: normal | |||||||||
| Nabeshima et al. (10) | 1 | 19 | Severe dysmenorrhea | TVUS | Right side of the uterus | 3 | Laparoscopy | Cystic adenomyoma | Symptoms disappeared |
| MRI | |||||||||
| HSG: normal | |||||||||
| Kamio et al. (11) | 1 | 23 | Severe dysmenorrhea | TVUS | Left side of the uterus anterior to the round ligament | 3 | Laparotomy | Adenomyotic cyst | Symptoms disappeared |
| MRI | |||||||||
| HSG: normal | |||||||||
| Takeda et al. (2) | 2 | 20 | Severe dysmenorrhea | TVUS | Right side of the uterus anterior to the round ligament | 3 | Laparoscopy | JCA | Symptoms disappeared |
| MRI | |||||||||
| HSG: normal | |||||||||
| Pyelography: normal | |||||||||
| 20 | Severe dysmenorrhea | TVUS | Left anterior uterine corpus caudal to the round ligament | 2.6 | Laparoscopy | JCA | Symptoms disappeared | ||
| MRI | |||||||||
| Pyelography: normal | |||||||||
| Wang et al. (12) | 1 | 26 | Severe dysmenorrhea | TVUS | Right anterior uterine horn | 3.2 | Laparotomy | Cystic adenomyoma | Symptoms disappeared (10 m) |
| Nabeshima et al. (13) | 1 | 27 | Severe dysmenorrhea | TVUS | Right anterior uterine corpus | 2 | Laparoscopy | Cystic adenomyoma | Symptoms disappeared (12 m) |
| MRI | |||||||||
| Ho et al. (14) | 1 | 16 | Chronic pelvic pain | TAUS | Right anterior uterine corpus | / | Laparoscopy | Cystic adenomyoma | N/A |
| MRI | |||||||||
| Ball et al. (4) | 1 | 19 | Dysmenorrhea | TVUS | Left uterine fundus, caudally to the round ligament | 2 | Laparoscopy | Cystic adenomyosis | Symptoms disappeared (18 m) |
| Hysteroscopy: normal | |||||||||
| Acien et al. (5) | 4 | 15 | Severe chronic pelvic pain | TVUS | Right anterior uterine wall at the level of the round ligament insertion | 3.5 | Laparotomy | ACUM | Symptoms disappeared |
| HSG: normal | |||||||||
| Pyelography: normal | |||||||||
| 21 | Severe dysmenorrhea | TVUS | Left anterior uterine wall at the level of the round ligament insertion | 3 | Laparotomy | ACUM | Symptoms disappeared (18 m) | ||
| HSG: normal | |||||||||
| 33 | Chronic pelvic pain | TVUS | Right anterior uterine wall at the level of the round ligament insertion | 3 | Laparoscopy | ACUM | Symptoms disappeared | ||
| HSG: normal | |||||||||
| 32 | Severe dysmenorrhea | TVUS | Right anterior uterine wall at the level of the round ligament insertion | 5 | Total hysterectomy (procedure?) | ACUM | Symptoms disappeared (12 m) | ||
| Tijani et al. (15) | 1 | 35 | Chronic pelvic pain | TAUS | Left posterior fundus | 2.1 | Laparotomy | Uterus-like mass | N/A |
| Liang et al. (16) | 1 | 17 | Severe dysmenorrhea | TAUS | Left broad ligament | 4.3 | Laparotomy | Uterus-like mass | Symptoms disappeared (18 m) |
| CT | |||||||||
| Takeuchi et al. (17) | 9 | 25.2 | 9/9 Dysmenorrhea | 9/9 TVUS | Lateral wall near the uterine round ligament attachment site. Right 6/9. Left 3/9 | 3.2 | Laparoscopy | JCA | Diminishing symptoms (35.9 m ± 21.4 m) |
| 9/9 MRI | |||||||||
| 9/9 Pyelography: normal | |||||||||
| 4/9 HSG: normal | |||||||||
| Akar et al. (18) | 1 | 15 | Severe dysmenorrhea | CT | Right lateral wall of the uterus | 4.76 | Robot-assisted laparoscopy | JCA | N/A |
| TVUS | |||||||||
| Chun et al. (19) | 1 | 19 | Severe dysmenorrhea | MRI | Left fundus | 3 | Laparoscopy | JCA | Diminishing symptoms (12 m) |
| Pyelography: normal | |||||||||
| Kriplani et al. (20) | 4 | 16 | Severe dysmenorrhea | MRI | Right uterine wall near fundus | 3.8 | Laparoscopy | Cystic adenomyosis | Symptoms disappeared (24 m) |
| 18 | Severe dysmenorrhea | MRI | Right uterine wall | 4.2 | Laparoscopy | Cystic adenomyosis | Diminishing symptoms (20 m) | ||
| 16 | Severe dysmenorrhea | MRI | Anterior myometrium | 3.1 | Laparoscopy | Cystic adenomyosis | Symptoms disappeared (14 m) | ||
| 24 | Severe dysmenorrhea | MRI | Right uterine wall | 3 | Laparoscopy | Cystic adenomyosis | Symptoms disappeared (12 m) | ||
| Acien et al. (21) | 4 | 36 | Chronic pelvic pain | TVUS | Left anterior uterine horn | 5 | Laparotomy (hysterectomy) | ACUM | Symptoms disappeared |
| 20 | Chronic pelvic pain | TVUS | Left anterior uterine wall below the insertion of the round ligament | 4 | Laparotomy | ACUM | Symptoms disappeared | ||
| MRI | |||||||||
| HSG: normal | |||||||||
| 18 | Chronic pelvic pain | TRUS | Left anterior horn below the insertion of the round ligament | 2.6 | Laparotomy | ACUM | Symptoms disappeared (2 m) | ||
| MRI | |||||||||
| 19 | Chronic pelvic pain | TVUS | Left anterior horn below the insertion of the round ligament | 2 | Laparotomy | 2×ACUM | Symptoms disappeared | ||
| HSG: normal | |||||||||
| Kumakiri et al. (22) | 1 | 20 | Severe dysmenorrhea | TVUS | Anterior side of the uterine body | 3 | Laparoscopy | JCA | Diminishing symptoms (3 m) |
| MRI | |||||||||
| Bedaiwy et al. (23) | 1 | 16 | Severe dysmenorrhea | TAUS | Left uterine wall | 3 | Laparoscopy | ACUM | Symptoms disappeared (9 m) |
| MRI | |||||||||
| Jain et al. (24) | 1 | 24 | Severe dysmenorrhea | TAUS | Right anterior uterine wall, below the insertion of round ligament | 4 | Laparoscopy | ACUM | Diminishing symptoms |
| MRI | |||||||||
| Paul et al. (25) | 3 | 19 | Chronic pelvic pain | TAUS | Right anterior uterine wall, below the insertion of round ligament | 2 | Laparoscopy | ACUM | Symptoms disappeared (1 m) |
| MRI | |||||||||
| 17 | Dysmenorrhea | TVUS | Posterior wall of the uterus | 4 | Laparoscopy | ACUM | Diminishing symptoms (36 m) | ||
| 25 | Dysmenorrhea | TAUS | Right uterine cornua | 3.1 | Laparoscopy | ACUM | Diminishing symptoms (84 m) | ||
| Pontrelli et al. (26) | 1 | 27 | Severe dysmenorrhea | TVUS | Posterior uterine wall | 7.5 | Hysteroscopy | Giant cystic adenomyoma | Symptoms disappeared (12 m) |
| MRI | |||||||||
| Garofalo et al. (27) | 1 | 17 | Severe pelvic pain | TVUS | Right anterior uterine wall at the level of the round ligament insertion | 1.7 | Laparoscopy | ACUM | Symptoms disappeared |
| TRUS | |||||||||
| MRI | |||||||||
| Shen et al. (28) | 1 | 37 | Severe dysmenorrhea | MRI | Left uterine wall near the cornua | 10 | Laparoscopy | Cystic adenomyoma | Symptoms disappeared (6 m) |
| Dadhwal et al. (29) | 1 | 23 | Severe dysmenorrhea | TAUS | Right anterior uterine wall near the cornua | 3.9 | Laparoscopy | JCA | Symptoms disappeared (12 m) |
| 1 | 16 | Severe dysmenorrhea | TAUS | Left uterine wall near | 4 | Laparoscopy | JCA | Symptoms disappeared | |
| MRI | below the insertion of the round ligament | ||||||||
| Peters et al. (30) | 2 | 19 | Dysmenorrhea | TVUS | Left uterine wall | 3 | Laparoscopy | ACUM | N/A |
| MRI | |||||||||
| 39 | Pelvic pain | TVUS | Left uterine wall | 2.3 | Laparoscopy | ACUM | N/A | ||
| MRI | |||||||||
| Strelec et al. (31) | 1 | 14 | Severe dysmenorrhea | TAUS | Right uterine wall | 4 | Laparoscopy | JCA | N/A |
| Peyron et al. (3) | 11 | 21 | Severe dysmenorrhea | MRI (11) | 7/11 Left | 2.8 | Laparoscopy | ACUM | Symptoms disappeared (23 m (range 6–27 m) |
| Chronic pelvic pain | 4/11 Right | ||||||||
| Park et al. (32) | 2 | 14 | Severe dysmenorrhea | TRUS | Right horn of the uterus | 3 | Laparoscopy | ACUM | Symptoms disappeared (24 m) |
| MRI | |||||||||
| 25 | Severe dysmenorrhea | TVUS | Left uterine wall | 3 | Laparoscopy | ACUM | Symptoms disappeared | ||
| MRI | |||||||||
| Protopapas et al. (33) | 1 | 14 | Severe dysmenorrhea | MRI | Left uterine cornua | 3.8 | Laparoscopy | JCA | Diminishing symptoms (12 m) |
| Kiyak et al. (34) | 1 | 27 | Chronic pelvic pain | TVUS | Right cornual area | 4.5 | Laparoscopy | JCA | Diminishing symptoms (3 m) |
| Supermaniam et al. (35) | 2 | 22 | Severe dysmenorrhea | TAUS | Right fundic area close to the tube insertion | 3.6 | Laparoscopy | ACUM | Symptoms disappeared |
| TR 3D-US | |||||||||
| MRI | |||||||||
| 36 | Severe dysmenorrhea | TVUS | Right intramural mass close to the round ligament insertion | 3.3 | Laparoscopy | ACUM | Symptoms disappeared (6 m) | ||
| Naftalin et al. (36) | 8 | 29.2 | Severe dysmenorrhea | TVUS or TRUS | N/A | 2.3 | Laparoscopy | ACUM | N/A |
| Chronic pelvic pain | |||||||||
| Mollion et al. (37) | 2 | 17 | Severe dysmenorrhea | TVUS | Left uterine horn | 3 | Laparoscopy | ACUM | N/A |
| MRI | |||||||||
| 23 | Severe dysmenorrhea | MRI | Left uterine horn | 3 | Laparoscopy | ACUM | N/A | ||
| Hu et al. (38) | 1 | 22 | Chronic pelvic pain | TVUS | Left side of the myometrial | 5 | Laparoscopy | ACUM | Symptoms disappeared |
| CT | |||||||||
| MRI | |||||||||
| Tokgoz et al. (39) | 1 | 17 | Severe dysmenorrhea and chronic pelvic pain | TAUS | Left side of the uterus | 2.5 | Laparoscopy | ACUM | Symptoms disappeared (24 m) |
| Dekkiche | 9 | 23 | Dysmenorrhea | MRI | Left uterine wall under insertion of round ligament | 1.7 | Robot-assisted laparoscopy | ACUM | N/A |
| 19 | Chronic pelvic pain | TV 3D-US | Right uterine wall under insertion of round ligament | 4 | Laparoscopy | ACUM | N/A | ||
| MRI | |||||||||
| 18 | Severe dysmenorrhea | TAUS | Left antero-fundic wall | 3.8 | Laparoscopy | ACUM | Diminishing symptoms (48 m) | ||
| MRI | |||||||||
| 22 | Chronic pelvic pain | TVUS | Right uterine wall under insertion of round ligament | 2.1 | Laparoscopy | ACUM | Persistent pain (48 m) | ||
| MRI | |||||||||
| 35 | Pelvic pain | TAUS | Right uterine wall under insertion of round ligament | 2.5 | Laparoscopy | ACUM | Symptoms disappeared (24 m) | ||
| MRI | |||||||||
| 18 | Severe dysmenorrhea | TVUS | Left uterine wall under insertion of round ligament | 1.8 | Laparoscopy | ACUM | Symptoms disappeared (6 m) | ||
| MRI | |||||||||
| 30 | Severe dysmenorrhea | TVUS | Right uterine wall under insertion of round ligament | 2.4 | Laparoscopy | ACUM | Persistent pain (2 m) | ||
| MRI | |||||||||
| 17 | Chronic pelvic pain | TVUS | Left antero-fundic wall | 3 | Laparoscopy | ACUM | Persistent pain (42 m) | ||
| MRI | |||||||||
| 18 | Severe dysmenorrhea | TAUS | Left fundic area close to the tube insertion | 2.6 | Laparoscopy | ACUM | Symptoms disappeared (1 m) | ||
| MRI | |||||||||
| Total | 87 | 21.89 | Dysmenorrhea: 60/88 Pelvic pain: 28/88 | MRI 62/88 | Right: 37/88 | 3.3534 | Laparoscopy: 73/88 | Symptoms disappeared: 48/88 | |
| US 67/88 | Left: 39/88 | Robot-assisted | |||||||
| Pyelography: 15/88 | Central: 4/88 | Laparoscopy: 2/88 | Diminishing symptoms: 19/88 | ||||||
| HSG: 13/88 | N/A: 8/88 | Laparotomy: 12/88 | |||||||
| CT 3/88 | Op-hysteroscopy: 1/88 | Persistent pain: 3/88 | |||||||
| Unknown procedure for 1 hysterectomy | N/A: 18/88 |
Review of the 79 published patients of ACUM in the literature and our 9 patients.
N/A, not available; CT, computerized tomography; JCA, juvenile cystic adenomyoma; HSG, hysterosalpingography; TVUS, transvaginal ultrasound; TRUS, transrectal ultrasound.
The clinical manifestations are always some form of pelvic pain; dysmenorrhea is the most prevalent symptom (68.2%), associated or not with CPP (31.8%).
The two most useful radiological procedures are 2D ultrasound and MRI. The latter was performed for 70.5% of the patients.
Usually, the mass is unique, but in rare cases, it can also be biloculated [3/88, 3.4% (26, 40)]. The lesion was lateralized 86% of the time, 42.0% right, 44.3% left, and astonishingly 4.5% were central. The mean size of the lesion was 3.4 cm. No relation between the variables “age” and “size of the lesion” was noted as shown in Figure 6. Linear regression analysis also found no relation between these two variables (R-squared = 0.03, p-value = 0.14).
Figure 6
Surgical resection was in 83.0% of the patients performed by laparoscopy which should be the privileged approach, in 13.6% of patients by laparotomy, in 2.3% of patients by robot-assisted laparoscopy and in 1.1% of patients by operative hysteroscopy. Clinical improvement occurred in almost all patients after surgical resection, except for a few patients (n = 3). To this day, no other aetiology was found for these three patients presenting persistent pain (endometriosis was excluded during laparoscopy). They are treated with conservative medical treatment.
4. Discussion
We consider Acién et al.'s physiopathologic hypothesis and their definition of this anomaly as the most appropriate for now and therefore decided to adopt the terminology and concept of ACUM. As opposed to some authors who consider this pathology as a focal or cystic form of adenomyosis, we do not, mainly because of its absence of recurrence, the young age of the affected patients and its pathological characteristics (point 4 of Acién's definition) which are clearly different from adenomyosis.
Regarding the age at diagnosis, which is considered for Takeuchi et al. in 2010 (17) as a diagnostic criterion when under 30, we would not be that restrictive. All the more since this diagnosis is often delayed after months or years of investigations or symptomatic treatments such as pain killers or hormonal treatments.
We want to insist on an important characteristic of an ACUM, which may not be clear enough in Acién et al.'s definition (5); the tube on the homolateral side of the lesion is always connected to the normal uterine cavity and is patent. This was already described by Takeuchi's definition of JCA (17). It also means that an ectopic pregnancy is not possible in the cavity of an ACUM. This is the principal criteria that distinguishes it from a uterine malformation type U4 (6), another rare type of Müllerian duct anomaly (also known as non-communicating rudimentary uterine horn or Robert's uterus) which is the principal differential diagnosis. It is also important to note that for now no ACUM has ever been associated with urinary tract malformation.
MRI is known as the imaging modality of choice to achieve complete exploration of female genital anomalies (41). It allows for a precise localization of the tumour and therefore helps for an appropriate curative and fertility-sparing laparoscopic resection (3). Indeed, MRI has a higher correlation with surgical findings compared with echography (42).
In case of an unclear diagnosis, complementary investigations with a hysterosalpingo-foam sonography, hysterosalpingography or per-operative chromopertubation must be performed. Fertility-preserving and non-invasive surgery is essential in these young patients.
In our experience, IHC is not mandatory for the diagnosis of ACUM, but it can help if the endometrium and the cytogenic chorion are difficult to locate on HE alone.
Salpingectomy is not indicated and definitely has to be avoided (except in the case of a coexisting tubal pathology of another ethology). Both the homolateral uterine artery and the round ligament must be preserved as much as possible. Nevertheless, if the size of the lesion is important, it can be difficult to stay minimally invasive while doing a complete resection.
Pontrelli et al. (26) described the only case of a successful hysteroscopic resection of an ACUM. This method was chosen because the MRI findings were suggestive of a bicornuate uterus with cornual hematometra in a non-communicating horn, so they planned to remove the wall of the lesion. The undeniable advantage of this technique is its short operative time and its minimal invasive character. One can question the quality of resection of the capsule which must be difficult to obtain. If this latter is incomplete, there might be a risk of recurrence. There is also the remaining issue of the future obstetrical outcome for these young patients because no sutures are made to reinforce the myometrium. This technique might also expose the patient to a higher risk of uterine rupture in case of future pregnancy than with an intra-abdominal access.
Transvaginal ultrasound-guided alcohol sclerotherapy is an interesting procedure gaining momentum in the treatment of ACUM. In 2020, the first patients was described by Merviel et al. (43) who used the same technique as for the treatment of ovarian endometriomas. In 2021, Naftalin et al. (36) reported on another four women treated with this procedure. One of them had a recurrence of symptoms 6 months after the sclerotherapy and therefore needed a laparoscopic resection. It is possible that the surgical intervention was planned due to lesion reappearance; however this is not specified by the authors. For these four patients, the diagnosis of ACUM was based on the haemorrhagic content of the mass found in cytology. As a definitive histologic diagnosis cannot be obtained with sclerotherapy, we did not include these patients in our review. This technique has several benefits over laparoscopy; it is shorter in duration, is performed under local anaesthesia, does not add an iatrogenic myometrial injury and therefore might not negatively affect the future obstetrical outcome, although information on the obstetrical risk after surgical resection of ACUM is still unknown.
While there are no reported cases of uterine rupture during pregnancy in the literature to date, one can imagine that the risk exists and is similar to that observed after an intramural myomectomy [0.93% according to Gambacorti-Passerini et al. (44)]. Patients need to be informed of this risk and be aware of it.
Finally, the incidence of ACUM is still unknown, but in the last two decades, there has been more and more literature available on this pathology, and the number of cases is increasing. This can be explained by the improvement of imaging techniques and improved knowledge of this pathology despite its rarity.
ACUM is now a well-defined uterine malformation with precise characteristics that should be known by gynaecologists and should be evoked in the differential diagnosis of severe dysmenorrhea and CPP. The decision of whether a conservative or a surgical therapy should be done has to be made with the patient according to their preferences. Long-term outcome for these patients is still unknown and has to be especially studied regarding the potential recurrence of the lesions and the obstetrical outcomes. Hysteroscopic resection and ethanol sclerotherapy are two new interesting therapeutic approaches that need to be explored in the future to treat ACUM.
ACUM is certainly underdiagnosed, because it is a poorly known pathology hardly ever researched in a context of acute and early dysmenorrhea. With our cases, we also want to stress that ACUM has to be thought of and looked for in the case of atypical, chronic pelvic pain, in pre-menopausal women.
Concerning the limitations of this study, we would highlight its retrospective character. Moreover, the heterogeneous qualitative description of the cases found in the literature makes the comparison between them difficult and limits the potential of meaningful statistical analysis. Finally, as ACUM is a rare pathology, the number of studied cases is relatively small, which makes its understanding still incomplete.
Statements
Data availability statement
The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding author.
Ethics statement
Written informed consent was obtained from the individuals’ and minors’ legal guardian for the publication of any potentially identifiable images or data included in this article.
Author contributions
SD and PM organized the database and contributed to the conception and design of the study. SD wrote the manuscript. MK contributed to the proofreading. ED, AF, MM, J-YM, and PM collected the data. All authors contributed to the article and approved the submitted version.
Acknowledgments
We want to thank A. Cavicchioli for the proof reading, Mrs. K. Lepigeon for the statistical analysis, Dr C. Matthey-Page, Dr K. Athanasiou and Dr A. Bouzerda Kawthar who helped for the data collection.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Summary
Keywords
ACUM, Müllerian anomalies, uterine malformations, dysmenorrhea, chronic pelvic pain
Citation
Dekkiche S, Dubruc E, Kanbar M, Feki A, Mueller M, Meuwly J-Y and Mathevet P (2023) Accessory and cavitated uterine masses: a case series and review of the literature. Front. Reprod. Health 5:1197931. doi: 10.3389/frph.2023.1197931
Received
31 March 2023
Accepted
04 July 2023
Published
17 August 2023
Volume
5 - 2023
Edited by
Takeshi Kurita, The Ohio State University, United States
Reviewed by
Akmal El-Mazny, Cairo University, Egypt Jumpei Terakawa, Azabu University, Japan
Updates
Copyright
© 2023 Dekkiche, Dubruc, Kanbar, Feki, Mueller, Meuwly and Mathevet.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Souad Dekkiche souad.dekkiche@gmail.com
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