PERICHIASMATIC GRANULOMA OCCURRING AFTER RADICAL MASTOIDECTOMY - MR FINDINGS

A case of chronic chemical meningitis occurring after a radical mastoi dectomy is reported. Imaging and surgical findings were suggestive of a dissemination of cholesteatoma debris within the subarachnoid spaces . Chemical meningitis has been described in epidermoid and dermoid cys t rupture. This report illustrates that clinicians should be aware of this possible complication. Skull base imaging is mandatory before con sidering the diagnosis of idiopathic meningitis, Only treatment of the abnormal communication between cerebrospinal fluid and middle ear may eradicate the origin of this rare meningitis.