A case of hypertrophic cranial pachymeningitis presenting with scleritis in a patient with undifferentiated connective tissue disease.

Hypertrophic cranial pachymeningitis (HCP) is an uncommon disorder that causes a localized or diffuse thickening of the dura mater and has been reported to be infrequently associated with systemic autoimmune disorders such as Wegener's granulomatosis, rheumatoid arthritis, sarcoidosis, Behçet's disease, Sjögren syndrome, and temporal arteritis. Here, we report a case of HCP initially presented with scleritis and headache in a patient with undifferentiated connective tissue disease (UCTD). HCP was initially suspected on brain magnetic resonance imaging and defined pathologically on meningial biopsy. Immunologic studies showed the presence of anti-RNP antibody. After high dose corticosteroid therapy, the patient's symptoms and radiologic abnormalities of brain were improved. Our case suggested that HCP should be considered in the differential diagnosis of headache in a patient with UCTD presenting with scleritis.