ABSTRACT
To assess the role*of MRI in differentiation between usual and unusual cerebellopontine angle [CPA] lesions.The study was conducted on 40 patients with signs and symptoms pointing to CPA lesions and subjectedto MRI examination.MRI showed usual lesions such as Schwannoma in 14 patients and meningioma in eight patients. Lessfrequent lesions include glomus tumour in five patients and chordoma in five patients. Unusual lesions such asepidermoid cyst, arachnoid cyst, ependymoma, medulloblastoma, expophytic glioma, papillary adenocarcinoma ofendolymphatic sac, metastatic adenocarcinoma and atherosclerotic basilar artery in one patient for each entity.MRI could differentiate between usual and unusual lesions by proper identification of the site, extentand signal characteristic of each lesion