Corticosteroid sensitivity in gliomatosis cerebri delays diagnosis.

Purpose: To describe a patient whose diagnosis of gliomatosis cerebri was delayed for one year due mostly to dexamethasone.

Patients And Methods: A 78-year-old woman was followed in clinic for a year with a brain lesion suspicious but not definitive for glioma, whose clinical course and neuroimaging varied with use of dexamethasone. A first biopsy and MR spectroscopy did not find evidence of malignancy.