Thirty-five cerebello-pontine angle lesions were diagnosed with simple skull X-ray, computed tomography, and angiography at Seoul National University Hospital from September, 1978 through August, 1982. The radiographic findings were analysed with emphasis on the differential points of C.T. among the major three cerebello-pontine angle tumors ; acoustic neurinoma, meningioma and epidermoid. The results are as follows : 1. Among the 35 cases of cerebello-pontine angle lesions, 19 cases were acoustic neurinoma. 5 cases meningioma, 4 cases epidermoid, 2 cases metastasis, 1 cases choroid plexus papilloma, 1 case arteriovenous malformation, and 3 cases intra-axial posterior fossa tumors. 2. The characteristic radiographic findings of acoustic neurinoma were widening of internal auditory canal, petrous bone erosion, posterior extension of tumor at the level of internal auditory canal, hypo or isodense mass on pre-contrast C.T. with high enhancement after intravenous contrast infusion, and cystic change within the mass. 3. Meningioma shows anterior extension of the lesion at the level of internal acditory canal, broad base and obtuse angle sign of the lesion with petrous bone, hyperdense mass on precontrast C.T. with highly homogeneous enhancement after intravenous contrast infusion. 4. Epidermoid characteristically shows hypodense mass on precontrast C.T. with no change after intravenous contrast infusion. 5. The differential points of the major 3 cerebello-pontine tumors were bone change, mass location, attenuation, degree of attachment to petrous bone, and cystic change.