cerebellopontine angle

noun

cer·​e·​bel·​lo·​pon·​tine angle ˌser-ə-ˌbel-ō-ˌpän-ˌtēn-, -ˌtīn- 

: a region of the brain at the junction of the pons and cerebellum that is a frequent site of tumor formation

The most common causes of secondary trigeminal neuralgia are multiple sclerosis and acoustic neuroma; tumors and cysts in the cerebellopontine angle may also cause trigeminal neuralgia.

—Emad Eskandar et al., The New England Journal of Medicine