The authors reviewed the CT findings of clinically & histopathologically proven 31 cases of orbital masses seen at the Chonnam national university Hospital from June 1983 to August 1989, to find characteristic findings and differential points among masses. There were 3 cases in intraocular, 6 cases in intraconal, 15 cases in extraconal and 7 cases in extraorbital space. The results were as follows : 1. The characteristic findings of masses were calcification in retinoblastoma, fatty density in dermoid cyst and strong contrast enhancement in cavernous hemagioma. 2. In lacrimal region, pleomorphic adenoma was round mass with mass effect and pseudolymhoma was oblong mass to mold itself to adjacent structures without mass effect. 3. Pseudotumor was irregular mass with multifocal infiltration and no mass effect. 4. Mucocele was expansile homogeneous mass without contrast enhancement.