The authors report on a case of solitary neurocysticercosis located in the
anterior third ventricle of a 21-year-old Hispanic man who presented with p
rogressive headache, nausea, and mental decline. The appearance of the lesi
on on computerized tomography and magnetic resonance studies was typical of
that of a colloid cyst, which was the presumptive preoperative diagnosis.
A transcortical-transventricular microsurgical approach was used, and inspe
ction of the anterior third ventricle via the ipsilateral foramen of Monro
revealed no lesion. Inspection of the floor of the ipsilateral lateral vent
ricle revealed the intact cyst, which had migrated since the preoperative s
tudies had been obtained. The lesion was removed intact, and histopathologi
cal examination confirmed the diagnosis of neurocysticercosis. The authors
review the radiographic findings in this case and further illustrate the po
tential for neurocysticercosis to masquerade as other intracranial lesions.