Cyst within the parenchyma of the optic chiasm.

Abstract

Various cysts associated with intraorbital and intracranial portions of the optic nerve have been described. Arachnoid cysts of the optic nerve in association with optic nerve glioma were described by Wolter and McKenney (I964); Holt (I966) described two cases of cysts of the intracranial portion of the optic nerve, and Smith, Hoyt, and Newton (I969) also described cysts of the anterior third of the left optic nerve. More recently Miller and Green (1975)

Cystic Optic Chiasm Lesion: Atypical Magnetic Resonance Imaging Findings

“…Chowdhury first described an arachnoid cyst within the optic chiasm in 1976. 1 Primary arachnoid cysts commonly occur as benign developmental anomalies, but, less frequently, there can be post-inflammatory accumulation of CSF in the subarachnoid space following intracranial haemorrhage, infection, or trauma. 2 The characteristic appearance of an arachnoid cyst on MRI is that of a well-defined, non-enhancing mass that is isointense with the CSF signal.…”