[The epidermoid tumor of the lateral cerebral ventricle; report of a case (author's transl)].

The authors report a case of epidermoid tumor of the lateral ventricle. Epidermoid tumors are relatively uncommon intracranial lesions and the one situated in the lateral ventricle has not been reported in this country. A 42 year old house wife was admitted to Asahi Central Hospital on February 14, 1973, complaining of progressive right hemiparesis for 2 years. The patient had no headache and no other symptoms of increased intracranial pressure. Neurological examination revealed disorientation, dyscalculia, amnestic aphasia, morter dysphasia, right facial paresis (central type) and right hemiparesis. The laboratory findings, which included complete blood count, serum electrolytes, urinalysis, electrocardiogram and blood Wassermann, were normal. Initial pressure of the spinal tap was 410 mmH2O and crystal clear CSF was obtained. tplain craniogram showed no calcification and was normal. The left CAG showed clearly the signs of the temporal lobe tumor (Fig. 1, 2, 3, 4.), but showed no early veins and no tumor stains. The brain scintigram was normal. A left temporo-parietooccipital craniotomy was performed. The epidural Echogram (horizontal section-Fig. 5, coronall section-Fig. 6) revealed the clear demarcated, multicystic round tumor in the inferior horn of the left lateral ventricle. After the whitesoap like tumor was totaly removed, the all interior surface of the left inferior horn of the lateral ventricle was seen (Fig. 8). Tumor was 5.5 cm in diameter and 50 g in weight. Histological findings of the tumor showed typical epidermoid (Fig. 9, 10). The origin of the intravetricular epidermoids and the usefulness of echo-encephalorgaphy were briefly discussed.