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CASE REPORT article

Front. Med., 16 April 2025

Sec. Obstetrics and Gynecology

Volume 12 - 2025 | https://doi.org/10.3389/fmed.2025.1509477

This article is part of the Research TopicAdvancements in Diagnostic and Management Strategies for Gynecological PathologiesView all 16 articles

Intrauterine ovarian torsion with autoamputation and intra-abdominal wandering mass: a report of three cases and literature review

Xinxing LiuXinxing Liu1Guojian DingGuojian Ding1Wenchao TianWenchao Tian1Xijie LiuXijie Liu1Tingliang Fu
Tingliang Fu1*Hongzhen Liu
Hongzhen Liu2*Aiqun Xu
Aiqun Xu3*Xinling Han
Xinling Han4*Wenyu Feng
Wenyu Feng1*Lei Geng
Lei Geng1*
  • 1Department of Pediatric Surgery, Binzhou Medical University Hospital, Binzhou, Shandong, China
  • 2Department of Pediatric Surgery, Children’s Hospital Affiliated to Shandong University, Jinan, China
  • 3Department of Gynaecology and Obstetrics, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong, China
  • 4Department of General Surgery, Caoxian People’s Hospital, Cao County, Shandong, China

Intrauterine ovarian torsion with autoamputation (IOTA) in fetuses was uncommon. The vague and non-specific symptomatology of IOTA makes early diagnosis challenging. Potential complications, such as hemorrhagic infarction of the adnexal structures with the subsequent sequelae, may occur. Moreover, therapeutic options, such as conservative or surgical management, for IOTA remain uncertain in the literature. We report three cases of IOTA, two of which were complicated by peritoneal adhesion or spontaneous bacterial peritonitis, confirmed surgically and through laboratory studies. A suspected diagnosis of this uncommon condition was made preoperatively in two cases. Our case reports provided additional information about this rare condition, including the occurrence of complicated bacterial peritonitis, in neonates and infants with IOTA. A review of the literature on imaging diagnosis and management options for IOTA is also included.

1 Introduction

Although the exact incidence is not known, ovarian cysts in fetuses are estimated to occur in 1 in 1000 to 2,500 live births, largely due to the widespread use of prenatal ultrasound (US) screening and magnetic resonance imaging (MRI). The prenatal ovary cyst torsion rate is 10% (1, 2). Its pathogenesis may be associated with maternal hormone stimulation (35). Gonadotropins, maternal estrogens, and human chorionic gonadotropin from the placenta may influence the development of the fetal ovary and simple ovarian cysts. Studies have shown that the occurrence of fetal cysts is higher in pregnancies with maternal diabetes, toxemia, and Rh isoimmunization due to elevated levels of gonadotropins. Moreover, premature infants often have a connection with simple ovarian cysts, likely due to the underdevelopment of the hypothalamic–pituitary–ovarian feedback system (2). Anechoic cysts, described as “simple” cysts, may resolve spontaneously before birth or within the first several months of life (5, 6). However, adnexal torsion in a fetus, as a well-recognized complication of a larger adnexal cyst, can occur occasionally (7, 8). A complex heterogeneous fetal ovarian cyst, described as “complex,” usually suggests intracystic bleeding, septations, autoamputation, and dystrophic calcification. A solid component is a significant sonographic hallmark for the diagnosis (6, 9, 10).

Intrauterine adnexal autoamputation due to ovarian cysts is an extremely rare entity in the pediatric population. Autoamputation of the ovary cyst indicates a severe cyst pedicle torsion following total ischemia and necrosis of the adnexal tissues (11). Ovarian cyst torsion may be asymptomatic or present with non-specific symptoms. If the torsioned ovaries become autoamputated, they may be present as free-floating intraperitoneal masses (10, 12). Prenatal and postnatal ultrasound and MRI follow-up were very useful in detecting suspicious ovarian cysts with torsion or complex cysts (10). On prenatal ultrasound follow-up at an interval of 1 week, the appearance of a fluid-debris level is usually considered a notable indicator of ovarian cyst torsion (10). Autoamputated adnexa usually cannot resolve spontaneously and may cause complications, such as compression to the adjacent organ and tissue, peritoneal adhesion, adhesive small intestinal obstruction, and even bacterial peritonitis (3, 5, 8, 10, 13). The management options for prenatally detected ovarian cysts remain controversial (14). Prenatally diagnosed larger complex ovarian cysts are often managed surgically in an attempt to save the ovary (15). However, the management of prenatal adnexa torsion with adnexal autoamputation remains uncertain, including the timing of surgical intervention, conservative management, aspiration, and surgical approach (8, 1420). Herein, we surgically treated three cases of intrauterine adnexal torsion with autoamputation (IOTA) and reviewed the literature to provide additional information on this rare disease entity.

2 Case reports

2.1 Case 1

A 45-day-old girl with a palpable abdominal mass was admitted to our clinic. A prenatal ultrasound screening detected an intra-abdominal cystic lesion of 1.62 cm × 1.22 cm × 1.60 cm at 28 weeks of gestation, which was a clear-cut cystic anechoic, round, unilocular, and thin-walled lesion, suggestive of a simple cyst of the left ovary (Figure 1A). No other anomalies were detected. The prenatal period had been uneventful. The baby was born vaginally at 39 weeks gestation, weighing 3,060 g. The infant was kept asymptomatic at birth. On admission, a mass of 3 cm in diameter was palpated in the left lower quadrant abdomen. Hematologic and biochemical investigations were normal. Tumor markers, including alpha-fetoprotein (α-AFP) and human chorionic gonadotropin (HCG), were within the normal range. The ultrasound follow-up at 6 weeks after birth showed a clear-cut solid lesion measuring 4.3 cm × 2.9 cm × 3 cm, containing hypoechoic and hyperechoic areas, suggestive of calcification in the left lower abdomen. An abdominal computerized tomography (CT) scan showed an uneven density mass of approximately 3.8 cm × 3 cm × 3 cm in the lower quadrant part of the abdomen, with an unclear boundary from the bladder wall. A strip-like high-density shadow was seen at the edge of the mass (Figure 1B).

Figure 1
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Figure 1. (A) Prenatal ultrasound scan showed a clear-cut cystic anechoic, round, unilocular, and thin-walled lesion, indicating a simple ovarian cyst originating from the left ovary. (B) Coronal CT image showed a solid mass with multiple calcifications. (C) Intraoperative findings showed a free-floating brownish lesion correlating to autoamputation of the left adnexa. (D) Histopathological examination showed tissue necrosis with focal calcification, with no sign of viable ovarian or fallopian tube tissue (H&E staining). LK, left kidney; CY, cyst; UB, urinary bladder; IOTA, intrauterine ovarian torsion with autoamputation.

At the age of 1.5 months, elective exploratory laparotomy via a left subumbilical transverse incision (mainly based on the location of the lesion) of 4 cm in length was performed. A free-floating, brownish, soft mass measuring 3.3 cm in diameter that attached to the greater omentum (Figure 1C) was identified in the left lower quadrant of the abdomen. The mass has a thin fibrous septum that is attached to the small intestine and posterior abdominal wall. The left ovary could not be identified with a blind ending of the left fallopian tube, indicating left ovarian autoamputation. The right ovary and fallopian tube looked normal, presented in their typical location, and were adequately suspended via the broad and ovarian ligaments. The autoamputated left ovarian mass was removed. Histopathological examination revealed a solid lesion of 5 cm × 4 cm × 3 cm with necrotic tissue and local calcification at the margin, without any viable ovarian tissue or signs of teratomatous elements or malignancy (Figure 1D). The postoperative recovery and 6-month follow-up were uneventful.

2.2 Case 2

A 2-day-old girl with a palpable abdominal mass was brought to our outpatient clinic. A prenatal ultrasound scan detected an intra-abdominal heterogeneous mass, 4 cm in diameter, at 35 weeks of gestational age. No other anomalies were detected. At 39+3 weeks of gestation, the baby was delivered by a cesarean section, weighing 3.55 kg. The infant remained asymptomatic. The physical examination revealed an abdominal mass, located in the right lower quadrant. Hematologic and biochemical parameters were normal except for a mildly elevated white blood cell count (12.51 × 109/L, neutrophils, 55.3%). Two days after birth, an abdominal ultrasound follow-up revealed a clear-cut heterogeneous mass of 4.7 cm × 3.5 cm × 4.0 cm without internal blood flow, suggestive of ovarian torsion. Exploratory laparotomy via a right paraumbilical vertical incision was performed. Intraoperative findings revealed that there was a small amount of peritoneal effusion that was collected for bacterial culture. A free-floating brownish solid mass was identified in the right lower quadrant of the abdomen, attached to sigmoid colon mesentery with thin fibrous septa. The right ovary could not be identified, and the right fallopian tube was a blind end, indicating autoamputation of the right adnexa. The uterus, the left ovary, and the fallopian tube looked normal. The autoamputated ovary was removed after aspiration of intracystic dark-red fluid (10 mL). Staphylococcus aureus was positive in the ascitic fluid culture and was sensitive to ceftazidime in antimicrobial susceptibility testing. A diagnosis of prenatal adnexal torsion with autoamputation complicated by bacterial peritonitis was confirmed. The baby girl received a 5-day course of ceftazidime (25 mg/kg intravenously, b.i.d.) postoperatively.

The histopathological examination revealed the mass contained connective tissue and calcification, without viable ovarian tissue, teratomatous elements, or malignancy, suggesting antenatal adnexal torsion. A paratubal cyst of 3 mm in diameter with a stalk in the mesentery of the left fallopian tube was removed, and the pathological examination showed an embryonic cyst. The postoperative recovery and 3-month follow-up were uneventful.

2.3 Case 3

A 6-week-old girl was transferred to our clinic with a palpable abdominal mass. A prenatal ultrasound scan found an intra-abdominal heterogeneous cystic mass at 35 weeks of gestational age. No other anomalies were detected. At 39 weeks of gestation, the baby was delivered by cesarean section, weighing 3,200 g. The infant remained asymptomatic. On admission, the physical examination revealed an abdominal mass of 7 cm in diameter in the right lower quadrant. Hematologic and biochemical parameters were normal. Ultrasound showed that a heterogeneous mass with focal hyperechoic areas on the margin, 7.5 cm × 5.4 cm × 3.9 cm in size, was located in the pelvis, suggestive of an ovarian cyst torsion with autoamputation and calcification. Laparoscopic exploration was performed via a 5-mm port that was inserted in the umbilical position for a 30° camera and two 3-mm ports that were inserted in the right or left mid-abdomen for surgical instruments, respectively. Laparoscopic exploration showed a free-floating brownish cystic mass located in the pelvis and the right lower quadrant, without an adhesion band. The right adnexa was absent. The left ovary and the fallopian tube appeared normal. The right ovarian autoamputation was confirmed and excised completely.

The histopathological examination revealed the mass containing necrotic tissues and scattered calcification, without viable ovarian tissue.

The postoperative period was uneventful, and the infant was discharged home 6 days after surgery.

3 Discussion

The incidence of fetal abdominal cysts detected on prenatal US scans, including a variety of clinical entities, has been increasing due to improved imaging screening (4, 13, 2123). Approximately 63% of female fetuses detected with intra-abdominal cysts on prenatal US scans are of ovarian origin. It is reported that approximately 30% of female neonates have ovarian cysts (22). Prenatal adnexal torsion will result in autoamputation due to hemorrhagic infarction, as seen in our cases. They are considered not to resolve spontaneously and cause clinical diagnostic uncertainty (5, 24). Our second and third cases presented a complex cyst on postnatal ultrasound check, suggestive of antenatal ovarian torsion with adnexal autoamputation.

Regarding the image appearance, based on pathological findings, fetal and neonatal ovarian cysts are usually classified as simple or complex on an ultrasound scan; the former is thin-walled, anechoic, homogeneous, and unilocular, whereas the latter is often thick-walled with a solid structure and septa and fluid-debris level (25).

Fetal ovarian cyst torsion may occur in the perinatal period. A complex cyst with the fluid-debris level, solid components, and calcification on ultrasound examination should be considered a significant hallmark of adnexal torsion and autoamputation (4, 5, 10). An MRI can reveal a complex cyst with a fluid level, and it can also be used in patients with an equivocal diagnosis or suspicion of malignancy (10). The CT scan can show a low-density mass with calcification (14, 26), as seen in our first case. The MRI and CT scans may enhance diagnostic accuracy (5).

Antenatal ovarian torsion (AOT) may mimic other intra-abdominal malformations, such as gastrointestinal duplication cysts, lymphatic malformations, mesenteric cysts, serous cystadenomas, urachal cysts, simple hepatic cysts, meconium pseudocysts, and retroperitoneal cystic teratomas (2730). Making a precise prenatal diagnosis is difficult; an early ultrasound scan after birth is needed for differential diagnosis (31, 32). In our case reports, IOTA was diagnosed before surgical intervention and was confirmed in the latter two cases.

In all, ultrasound scans are usually used for the diagnosis of fetal or neonatal intraabdominal lesions (3, 3335). Tyraskis et al. (13) recently concluded that fluid-debris levels, solid components, and calcifications on ultrasound scans may indicate ovarian loss caused by previous severe torsion. While for those with an ambiguous diagnosis of IOTA, MRI and CT scans may enhance diagnostic accuracy (3638).

Regarding the complications of the fetal ovarian cysts, the larger cysts (>4.0 cm in diameter) will increase the occurrence of complications, including torsion, rupture, intracystic bleeding, bacterial peritonitis, compression, and adhesive intestinal obstruction (13, 19, 22, 27, 39, 40). In our case series, intraoperative findings revealed that autoamputated adnexa had an attachment to the posterior peritoneum, small intestine, or sigmoid mesentery with thin fibrous septa, which pose a risk of long-term complication of peritoneal adhesion, even adhesive intestinal obstruction (41). It is assumed that inflammation and subsequent adhesions were caused by a torsed necrotic ovary (2). Our first case had a simple cyst first detected by an ultrasound scan at 28 weeks of gestational age. Postnatal ultrasound scan showed the lesion becoming a clear-cut solid mass containing hypoechoic and hyperechoic areas, suggestive of IOTA; the second and third cases represented a cystic lesion with anechoic and fibrous echoes at 38 and 35 weeks of gestation, respectively, indicating IOTA. Moreover, our second case presented with bacterial peritonitis, which has not been reported before. As for the complication of peritonitis, it is seldom reported in the literature. Nichols and Julian (40) described the occurrence of infection and peritonitis followed by adnexal torsion with ovary gangrene. In our case reports, a 2-day-old girl had Staphylococcus aureus growth in abdominal effusion. This may be associated with gangrenous cysts and needs to be further investigated (25, 40).

Treatment options for neonates and infants with antenatally detected ovarian cysts included conservative management, image-guided percutaneous aspiration, laparoscopy-guided aspiration, laparoscopic or open cystectomy, or oophorectomy. Until now, the evidence on the treatment of fetal ovarian cysts is very limited (1).

The decision to intervene should depend on cyst size, ultrasound characteristics, lesion progression, and clinical representation (10, 18, 21, 22, 27, 33, 34, 39).

Most simple cysts of <4 cm in diameter and approximately half of complex cysts will resolve spontaneously before birth and within 6 months of age (4, 15, 16, 42). Data have shown that there is no advantage for anechoic fetal cysts via prenatal aspiration or in-utero aspiration (IUA), so it should be performed individually (31, 41). However, it is reported that ultrasound-guided prenatal aspiration of simple ovarian cysts >40 mm seems to be related to a significant benefit in terms of preservation of the ovarian parenchyma (1). These risks must be weighed against the probability of cyst regression (31). However, compared to expectant management, IUA was associated with a reduced oophorectomy rate (43). Surgical removal should be considered when the cyst rapidly increases in size, develops complications, or fails to resolve (4, 44). Conservative versus surgical treatment for IOTA on postnatal ultrasound scans remains controversial. Postnatal observation, advocated as initial management, regardless of cyst size or ultrasound characteristics, spares 50% of newborn babies with prenatal ovarian cyst torsion from unnecessary surgical procedures and does not increase oophorectomy rate (16, 21, 27, 36, 39). We choose surgical intervention for IOTA due to the symptom of a palpable abdominal mass. Table 1 summarizes the management options according to guidelines and literature (1, 2, 21, 42, 4550).

Table 1
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Table 1. The management options for ovarian cysts in fetuses and infants.

Regarding the timing of surgical intervention, it is difficult to manage in the early days of life, and early surgical intervention will not improve ovarian preservation (2, 13). Whether an early surgical intervention can improve the outcome in those neonates with ovarian cyst torsion detected prenatally is yet to be established. Neonates with large ovarian cysts (>40 mm) or cysts with fluid-debris levels (the intracystic hemorrhage appearance of an ultrasound scan) usually require early surgical treatment to save the viable ovarian tissue (3, 4, 36, 51, 52). However, once adnexal autoamputation occurs prenatally, the ovary usually is no longer salvageable, and surgical intervention in neonates without symptoms may add risk with no benefit except making the diagnosis (36).

Autoamputated ovarian can be safely excised due to no viable ovary tissue (8, 10). Surgical intervention, such as laparoscopic cyst aspiration and fenestration, can be given for simple ovarian cysts >4 cm within the 2 weeks of life, and serial ultrasound follow-up should last 3 months (40). For a torsioned necrotic-appearing ovarian cyst, viable ovarian tissue should be preserved wherever possible (18, 40).

In conclusion, ovarian cyst torsion with autoamputation in a fetus was uncommon. We reported three patients with IOTA, including one patient complicated with peritoneal adhesion and another patient with bacterial peritonitis. Surgical exploration, including a laparoscopic approach and an excision of the autoamputated ovarian cysts, was needed for each patient with a good outcome. Further research is needed to better define the management options of IOTA, and a guideline is deemed essential to avoid unnecessary surgical interventions.

Data availability statement

The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.

Ethics statement

The requirement of ethical approval was waived by Binzhou Medical University Hospital for the studies involving humans because retrospective case reports and literature review. The studies were conducted in accordance with the local legislation and institutional requirements. Written informed consent for participation in this study was provided by the participants’ legal guardians/next of kin. Written informed consent was obtained from the participants’ legal guardians/next of kin for the publication of any potentially identifiable images or data included in this article.

Author contributions

XXL: Conceptualization, Investigation, Methodology, Writing – original draft. GD: Conceptualization, Investigation, Methodology, Writing – original draft. WT: Investigation, Methodology, Writing – original draft. XJL: Conceptualization, Investigation, Writing – original draft. TF: Conceptualization, Investigation, Methodology, Supervision, Validation, Writing – original draft, Writing – review & editing. HL: Conceptualization, Investigation, Methodology, Writing – original draft, Writing – review & editing. AX: Conceptualization, Methodology, Writing – original draft, Writing – review & editing. XH: Conceptualization, Methodology, Writing – original draft, Writing – review & editing. WF: Investigation, Writing – original draft, Writing – review & editing. LG: Conceptualization, Supervision, Writing – review & editing.

Funding

The author(s) declare that no financial support was received for the research and/or publication of this article.

Acknowledgments

We thank the colleagues of the Department of Pediatric Surgery and Department of Gynecology and Obstetrics for their cooperation as well as the enthusiastic support from the operating room team.

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.

Generative AI statement

The authors declare that no Gen AI was used in the creation of this manuscript.

Publisher’s note

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Keywords: fetal ovarian cyst, adnexal cyst, antenatal ultrasound, adnexal torsion, ovarian autoamputation, bacterial peritonitis, surgery

Citation: Liu X, Ding G, Tian W, Liu X, Fu T, Liu H, Xu A, Han X, Feng W and Geng L (2025) Intrauterine ovarian torsion with autoamputation and intra-abdominal wandering mass: a report of three cases and literature review. Front. Med. 12:1509477. doi: 10.3389/fmed.2025.1509477

Received: 11 October 2024; Accepted: 27 March 2025;
Published: 16 April 2025.

Edited by:

Cristina Secosan, Victor Babeş University of Medicine and Pharmacy, Romania

Reviewed by:

Andrea Lombisani, Fatebenefratelli Hospital, Italy
Francesco Morini, Sapienza University of Rome, Italy
Tanvir Kabir Chowdhury, Chittagong Medical College, Bangladesh

Copyright © 2025 Liu, Ding, Tian, Liu, Fu, Liu, Xu, Han, Feng and Geng. 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: Tingliang Fu, ZHJmdXRsQHNpbmEuY29t; Hongzhen Liu, bGl1aG9uZ3poZW41MjAwM0BhbGl5dW4uY29t; Aiqun Xu, eHVhaXF1bjY2NjZAMTYzLmNvbQ==; Xinling Han, ZHJmdXRsMDgyOEBhbGl5dW4uY29t; Wenyu Feng, ZmVuZ3dlbnl1MEAxMjYuY29t; Lei Geng, MzgxODExNDFAcXEuY29t

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