UNUSUAL LESIONS OF THE INTERNAL AUDITORY-CANAL

Acoustic neuromata (AN) account for nearly 90 per cent of internal aud itory canal (IAC) and cerebello-pontine angle (CPA) tumours. The secon d most common tumour is meningioma. Rare lesions include primary chole steatoma, facial neuroma, lipoma, angioma and various cysts. Two cases of IAC tumour are presented, one of hamartoma in which smooth muscle was prominent and the other of lymphangioma. Of interest are the speci fic clinical and radiological features associated with these lesions.