chiasmatic cistern

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chi·as·mat·ic cis·tern

a dilation of the subarachnoid space below and immediately rostral to the optic chiasm.
References in periodicals archive ?
The most common sites of tuberculous meningitis are the sylvian fissure, the chiasmatic cistern, and the perimesencephalic cistern.
Pattern of hemorrhage Location of aneurysm Anterior interhemispheric fissure Anterior communicating artery Chiasmatic cistern Carotid terminus Sylvian fissure MCA bifurcation 4th ventricle PICA