Orbital neurilemmoma. Presenting as retrobulbar neuritis.

Neurilemmoma of the orbit is a localized, encapsulated, benign nerve sheath tumour which grows very slowly and possibly intermittently, and has no distinctive clinical features (Reese, I963). When large enough it causes exophthalmos and sometimes blurring of vision through pressure on the optic nerve (Reese, I963; Sharma and Kulshrestha, I961). The motility of the eyeball may also be impaired. This tumour has rarely been recorded in the literature and we have been unable to find any previous report that it may first present with the clinical features of retrobulbar neuritis.