Cranial nerves hyperactive dysfunction syndromes in combination with extracerebral tumors of posterior fossa

Abstract

22 cases of hyperactive dysfunction syndromes (HDS) of cranial nerves (20 — trigeminal neuralgia, 2 — hemifacial spasm) in combination with extracerebral tumors in posterior fossa (9 — meningioma, 6 — acoustic nerve tumor, 6 — cholesteatoma, 1 — angiolipoma) were observed. Clinical investigation, MRI and intraoperative microtopography of nerves, vessels and tumors relationships were conducted.A conclusion was made that single tumor compression of cranial nerve is not enough for HDS development. HDS of cranial nerves in case of tumor in posterior fossa develops when vascular compression exists.