====== Cerebellopontine angle cistern ======

The [[cerebellopontine angle]] (CPA) [[cistern]] is situated in the lateral angle between the [[cerebellum]] and the [[pons]]. 

====Boundaries====
superior: tentorium cerebelli

posterior: anterior surface of cerebellum

inferior: lower cranial nerves

anterior: cerebellar hemisphere

anterolateral: posterior surface petrous temporal bone

medial: pons

It contains:

The seventh (VII) and eighth (VIII) cranial nerves.

The anteroinferior cerebellar artery (AICA).

The fifth (V) cranial nerve and the petrosal vein.

The volumetric parameters of the CPA cistern are a marker for understanding the pathogenesis of TN and useful for predicting the recurrence after MVD. The Cistern Deviation Index might contribute to deciding the surgical approach.