Suprasellar cistern

Last revised by Craig Hacking on 3 Aug 2022

The suprasellar cistern (also known as the chiasmatic cistern or pentagon of basal cisterns) is one of the cerebrospinal fluid-filled subarachnoid cisterns.

Gross anatomy


The suprasellar cistern is located above the sella turcica, under the hypothalamus and between the uncus of the temporal lobes. It has roughly the shape of a pentagon at the level of the optic chiasma, and of a six-point star at the level of cerebral peduncles. 


It contains the proximal part of the Sylvian fissure (sometimes separately termed the Sylvian cistern), the optic chiasm, the infundibular stalk and the cerebrovascular circle of Willis


It is continuous posteriorly with the interpeduncular cistern.

Related pathology

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Cases and figures

  • Case 1a: labeled 29
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  • Case 1b: labeled 52
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  • Case 2: filled with subarachnoid blood
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