The diagnosis of cysticercosis of central nervous system should be considered in patients with seizures, symptoms of increased I.C.P. or focal neurologic sign, with a history of having lived in an endmic area, particularly in Korea. Since these cysts usually continue to grow and medical treatment is very limited it is important to identify them and consider the feasibility of removing them surgically. 20 cases of surgically proven cysticercosis of the central nervous system were radiologically analyzed, experienced at Seoul National University Hospital. Radiologic studies include plain radiography of the skull, angiography, ventriculography, and CT scanning which is especially effective in diagnosis of diffuse parenchymal cysticercosis. The results are as follows: 1. Male to female ratio is 11:9 and mean age of the patients is 36 years. The cardinal symptoms and signs are seizures (50%), symptoms of increased I.C.P. (45%), mental change (20%) and focal neurologic sign (20%). 2 The distribution of cysts are cerebral parenchymal (40%), 4th ventricle (30%), 3rd ventricle (10%), leptomeningeal (30%), and intraspinal form (15%). 3. Simple skull film shows sign of increased I.C.P.(25%) but no case of calcification. In carotid angiography hydrocephalus is detected in all 13 cases. Displacement of adjacent vessels is seen in 2 cases of parenchymal form. Ventriculography shows dilated ventricles with free floating avoid filling defect in intraventricular form and 4th ventricle outlet obstruction in leptomeningeal form. 4. Of spinal cysticercosis 2 cases are leptomeningeal and 1 case intramedullary form. 2 cases are found in cervical portion and 1 case in cauda equina region. Myelography reveals filling defect not distinguishable from other tumorous condition. 5. On CT scanning variable degree of hydrocephalus is seen including round symmetric expansion of cyst-containing ventricle. In leptomeningeal form enlarged cisterna magna is demonstrated without any enhancem nt or outline of cystic wall. In parenchymal form there are multiple round areas of low density with slight ring-enhancement in postcontrast study. 6. CT is very helpful to determine surgical indication, to evaluate the function of VA shunt and to detect the appearance of new cysts in post-operative patients.