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Mucus-secreting adenomas or acinar adenoma of the choroid plexus are very rare. We report the case of a 79-year-old male with a 3-year history of occipital headaches with vomiting, ataxia and cerebellar signs. He was first seen due to difficulty while walking. He was admitted to the hospital with significant tumor expansion and clinical deterioration. CT and MRI revealed obstructive hydrocephalus secondary to a large fourth ventricular cyst mass, which enhanced markedly on contrast administration. Pathological findings were consistent with an acinar choroid plexus adenoma. The tumor was attached to the ependymal lining and was strongly adhered to the walls and floor of the IV ventricle. Post-operative bleeding complicated partial removal of this tumor. The patient died 6 h after surgery.

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The parasitic infection of the central nervous system due to Cysticereus ceZZuZosue usually affects the intracranial structures. The spinal form of neurocysticercosis is uncommon, anatomically confirmed cases range from 0.77 to 5.85% among all cases of neurocysticercosis. Even fewer cases appear as spinal intramedullary cysticercosis (SIC); no more than 49 confirmed cases have been reported in the literature. One case of SIC is reported here. The patient showed both motor and sensory symptoms that improved after surgery. One year later he is working again and only hyperreflexia has been detected. Although the magnetic resonance imaging studies showed a cystic intramedullary lesion it was considered to be spinal glioma; only after histologic study was the exact diagnosis made. The clinical symptomatology in these cases is due to compression of descending and ascending spinal tracts; the clinical diagnosis may be suspected in countries where cysticercosis is endemic. Modem neuroimaging techniques provide higher possibilities of accurate diagnosis; however, it can only be established with certainty by histologic study of the surgical specimen.

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