In the central and southern parts of Brazil the incidence of cerebral cysticercosis is very high. Infestation is easy, the clinical manifestations are severe and the therapeutic resources are rather ineffectual. Four cases with ventricular obstruction are reported. Two of them presented obstruction in the lateral ventricle and the remaining in the aqueduct of Sylvius. The main complaint was paroxysmal headache in every case, with the objective signs of intracranial hypertension. The cases with localization of the parasite in the aqueduct of Sylvius showed the Parinaud's syndrome. Diagnosis received confirmation from plain-X-ray and pneumo-encephalographic studies and from the examination of the cerebrospinal fluid. Surgical desobstruction was successful in three cases. The fourth patient died three months after the operation.