Cystic Optic Chiasm Lesion: Atypical Magnetic Resonance Imaging Findings

ABSTRACT

Intrinsic cystic lesions in the optic chiasm are an uncommon cause of bitemporal hemianopia compared with compressive lesions extrinsic to the chiasm. A 40-year-old man presented with difficulty driving. Clinical assessment revealed a bitemporal hemianopia. Magnetic resonance imaging showed an unusual cystic appearance of the chiasm. The appearance was felt to be most likely secondary to previous infective or inflammatory disease, but biopsy was not undertaken given the very significant risk of further visual loss.

KEYWORDS:

• Bitemporal hemianopia
• cyst
• cystic lesion
• intrinsic cystic lesion
• optic chiasm

Declaration of interest

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the article.