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Frontiers in Neurology

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Clinical Case Study ARTICLE

Front. Neurol., 13 October 2014 | https://doi.org/10.3389/fneur.2014.00192

Bilateral vision loss secondary to pachymeningitis in a patient with IgG4-related disease

  • Roxanna Todd Hodges Comprehensive Stroke Clinic, University of Southern California, Los Angeles, CA, USA

IgG4-related disease (IgG4-RD) is a recently recognized fibroinflammatory condition associated with disease in nearly every organ, including the meninges. A proportion of idiopathic hypertrophic pachymeningitis cases may involve a component of meningeal IgG4-RD. We present a patient with severe bilateral vision loss found to have thickening of the dura mater on MRI, and subsequently diagnosed with IgG4-RD after dural biopsy.

Case

A 44-year-old man presented to the emergency department with progressive vision loss. He reported worsening vision for 8 days to near blindness, new-onset severe, and pressure like, non-pulsatile headache. Past medical history was remarkable for diabetes, hypertension, dyslipidemia, and rheumatoid arthritis. Vital signs were stable and the neurological examination showed no light perception on the OS, and only hand motion perception on the OD.

Non-contrast CT of the head showed no intracranial abnormality. Ophthalmological evaluation found no apparent explanation for the visual loss. Dexamethasone therapy was initiated. Contrast-enhanced MRI of the brain done 1 day later showed diffuse thickening and enhancement of the dura, greater on the left side (Figure 1A). MRI of the orbits showed bilateral enhancement of the posterior aspect of the intraconal optic nerve sheath (Figure 1B). Lumbar puncture demonstrated an opening pressure of 32 mm H2O, glucose 90 mg/dL, protein content of 44 mg/dL, RBC 1, and WBC 21 (80% lymphocytes, 16% monocytes, 4% neutrophils). Gram stain, cultures, and cytology were negative. IgG index was 1.09 (reference <0.66), and IgG was 13.3 mg/dL (range 0.8–7.7). A left frontal dural biopsy was performed.

FIGURE 1
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Figure 1. There is diffuse smooth enhancement of the pachymeninges (A), left greater than right, with apparent thickening (B). Globes are normal in their size, shape, and signal intensity on all pulse sequences. No evidence of intra or extraconal soft tissue mass. Bilateral enhancement of posterior intraconal optic nerve sheath with normal signal intensity of optic nerves.

The patient’s vision continued to improve with steroid therapy and on day 10, VA was noted to be 20/20 on the OD and 20/30 on OS. Pathological evaluation showed pachymeningitis with increased IgG4 plasma cells (Figure 2). Given the clinical, laboratory, and pathology results, a diagnosis of IgG4-related disease (IgG4-RD) was made. Serum IgG4 drawn on the day of hospital discharge revealed elevated levels of 182.0 (reference range 4–86).

FIGURE 2
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Figure 2. Hematoxylin and eosin (H&E) stain at high power (A) and low power (B) demonstrate dural thickening with prominent lymphoplasmacytic infiltrate. On high power (A), the infiltrate is composed of mostly plasma cells. Immunohistochemical stain for IgG (C) and IgG4 (D) demonstrate that most of the plasma cells are positive for IgG and that the vast majority of the plasma cells are IgG4 positive.

Discussion

IgG4-related disease is a recently recognized fibroinflammatory condition first linked to autoimmune pancreatitis (AIP) in 2001 when pancreatic specimens from patients with AIP were found to have large numbers of IgG4 positive cells (1). In 2003, Kamisawa et al. reported extrapancreatic lesions in patients with AIP containing histopathology identical to that found in the pancreas. It was thus suggested that AIP was part of a larger systemic disease and not just confined to the pancreas (2).

Since then, IgG4-RD has been associated with disease involving nearly every organ system including pancreas, salivary glands, lacrimal glands, thyroid, pituitary, lungs, aorta, pericardium, liver, biliary tree, kidneys, retroperitoneum, breast, prostate, lymph nodes, skin, periorbital tissues, and the meninges (13). Tissues from involved organs demonstrate similar histopathological features of lymphoplasmacytic infiltration, many IgG4 positive plasma cells, and fibrosis (1, 2).

The meninges may be involved either intracranially or intraspinally with a predilection for involvement of the pachymeninges rather than the leptomeninges (1). The MRI findings of thickened dura, along with characteristic histology of fibrosis and lymphoplasmacytic infiltrates, fulfill the clinicopathological features of hypertrophic pachymeningitis (HP), a rare fibroinflammatory lesion causing thickening of cranial and/or spinal dura (4). HP may be due to infections such as tuberculosis and syphilis, systemic autoimmune diseases, neoplasms, or may be idiopathic (4). It is believed that a proportion of previously reported cases of idiopathic hypertrophic pachymeningitis (IHP) actually represent IgG-RD. A recent retrospective study analyzed 10 cases of IHP and showed evidence of IgG4-RD histopathology in 5 of the 10 (2, 3).

IgG4-related vision loss is rare. IgG4-RD can present as non-specific constitutional symptoms at the time of diagnosis, or more likely as a sub-acute expanding mass, with disease confined to a single organ for many years (1, 2). A proportion of cases of IHP have demonstrated IgG4-RD. IHP presents with radiculomyelopathy, headaches, cranial nerve palsies, papilledema, and unilateral or bilateral visual loss (1, 2, 4, 5). These presentations can also be included as those of IgG4-RD. The visual loss associated with HP has been attributed to inflammatory optic neuropathy. Other potential mechanisms of visual loss include infiltrative and compressive retrobulbar optic neuropathy (6, 7).

Conclusion

We describe a patient with visual loss due to pachymeningitis from IgG4-RD. We believe that a proportion of IHP actually represents IgG4-RD and that clinicians should consider testing for this condition with biopsy and IgG4 immunostaining. Establishing a diagnosis of IgG4-RD is important in planning immunosuppressive therapy to prevent future complications.

Teaching Points

Consider IgG4-RD in the differential diagnosis of HP. Definitive diagnosis of IgG4-RD requires biopsy demonstrating characteristic histopathology along with IgG4 immunostaining. Initial outcome is favorable with corticosteroids, though response is often unsustained in the long-term, thus, additional immunosuppressive agents may be required. Patients with single organ involvement of IgG4-RD should be followed and screened for systemic involvement as disease may develop in multiple locations.

Conflict of Interest Statement

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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Keywords: IgG4-related disease, pachymeningitis, vision loss, IgG4, dural thickening

Citation: Ramirez L, D’Auria A, Popalzai A and Sanossian N (2014) Bilateral vision loss secondary to pachymeningitis in a patient with IgG4-related disease. Front. Neurol. 5:192. doi: 10.3389/fneur.2014.00192

Received: 29 May 2014; Accepted: 15 September 2014;
Published online: 13 October 2014.

Edited by:

Gregory Gruener, Loyola University, USA

Reviewed by:

Jose Biller, Loyola University Medical Center, USA
Gregory Gruener, Loyola University, USA

Copyright: © 2014 Ramirez, D’Auria, Popalzai and Sanossian. 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) or licensor 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: Lucas Ramirez, Roxanna Todd Hodges Comprehensive Stroke Clinic, University of Southern California, 1520 San Pablo St, STE 3000, Los Angeles, CA 90033, USA e-mail: drlucasramirezmd@gmail.com