A 60-year-old woman presented with fever and headache. Neurological examination was unremarkable. However, anti-SS-A (Sjögren’s Syndrome-A) and anti-SS-B antibodies were detected in the serum without dry eye or dry mouth. Later, generalised tonic convulsions occurred and administration of levetiracetam was initiated. She was referred to our department due to the presence of dysesthesia on the left side of the body. Neurological examination confirmed dysesthesia in the left side of the body including the face. Deep tendon reflex was exaggerated in all extremities, with positive Hoffmann and Trömner’s reflexes. Meningeal irritation signs were not observed. Serum immunological tests, including those for angiotensin converting enzyme (ACE), proteinase-3-anti-neutrophil cytoplasmic antibodies (PR3-ANCA), and myeloperoxidase-anti-neutrophil cytoplasmic antibodies (MPO-ANCA), were negative. Serum IgG4 level was within the normal range. Saxon and Schirmer’s tests were positive, and the patient was diagnosed with Sjögren’s syndrome (SS). Cerebrospinal fluid (CSF) examination showed a slight elevation of protein level with a normal glucose level and cell count. Brain magnetic resonance imaging (MRI) showed thickened dura mater in the right parietal region in a diffusion-weighted image (DWI) and in a fluid-attenuated inversion recovery image (FLAIR) (Fig. 1A and B). Hypertrophic pachymeningitis (HP) was suspected, and a dural biopsy was performed. The pathological findings showed mild fibrosis and infiltration of inflammatory cells. No malignant lesion or presence of vasculitis was detected (Fig. 1C and D). Immunohistochemically, cerebral cortex on the surface staining revealed both CD3 and CD20 positive lymphocytes, and CD68-positive microglia, in the perivascular region. All of these glial cells were negative for IDH-1, and ATRX expression was well retained. Although dural pathology showed only mild inflammation, due to the exclusion of other diseases we diagnosed HP associated with SS. After the dural biopsy, the patient was treated with two courses of intravenous methylprednisolone (1 g/day) for three days. Soon after the treatment, the patient’s headache and dysesthesia improved, and oral prednisolone (50 mg/day) was started, followed by gradual tapering. A brain MRI 94 days after the treatment showed an improvement of the thickened region (Fig. 1E and F). Currently, the patient’s treatment comprises oral prednisolone at 10 mg/day without the recurrence of symptoms. HP is a rare disease characterised by thickened dura mater. This disease often presents with headache, fever, visual loss, and double vision with accompanying cranial nerve pathology (frequently in cranial nerves II–VIII). Occasionally, HP occurs idiopathically. Infection, sarcoidosis, and certain autoimmune diseases have been reported as secondary causes of HP. In a nationwide survey of 159 HP patients conducted in Japan, the underlying disease was revealed to be idiopathic in 44%, ANCA-related in 30.2%, and IgG4/multifocal fibrosclerotic systemic disease-related in 8.8% of the cases [1]. In our review of the literature, nine cases of HP associated with SS have been reported worldwide (Table S1). Consistent with the presented case, frequent clinical features in these nine cases were fever and headache that developed following neurological symptoms such as increased deep tendon reflexes, sensory disorders, or muscle weakness. The site of dural thickening was variable: three cases of spinal thickening and seven cases in intracranial
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