A patient on chronic haemodialysis because of renal failure developed progressive visual field loss and eventual blindness. A postmortem examination indicated that the blindness was caused by granulomatous thickening of the pachymeninges which constricted the optic nerves as they passed through the optic foramina. Exhaustive bacteriological and histopathological studies failed to identify a specific cause for this hypertrophic cranial pachymeningitis.
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