Malignant optic glioma presenting radiologically as a "cystic" suprasellar mass: case report and review of the literature.

The diagnosis of malignant glioma of the optic nerves and chiasm may be difficult because these rare lesions may mimic other suprasellar lesions. We report a case of glioblastoma multiforme of the optic chiasm in which the appearance of the lesion on computed tomographic (CT) scan was consistent with that of craniopharyngioma or cystic pituitary adenoma. We suggest that malignant optic glioma should be considered in the differential diagnosis of an adult with progressive visual loss of rapid onset, even when ophthalmological examination strongly suggests extrinsic compression of the anterior optic pathways and when the CT scan apparently indicates a cystic mass lesion.