[Case report of paraventricular cerebral cyst of infant (author's transl)].

A case of paraventricular cerebral cyst was reported. A 48-day-old infant was admitted to the Department of Neurosurgery with an enlargement of head circumference. Cerebral angiography, pneumoventriculography, and computed tomography showed a cyst in the trigon of the right lateral ventricle and unilateral hydrocephalus. Right-parieto-occipital craniotomy was done. The trigone of the right lateral ventricle was opened and the wall of the cyst was subtotally removed. A partial defect of the corpus callosum and other additional cysts at the quadrigeminal region were identified. On light microscopy, the inner layer of the cyst, protruding into the lateral ventricle, consisted of columnar cells and outer part of the wall was formed of loose connective tissue and glial tissue. On electron microscopy, the cells of the cyst wall was formed of loose connective tissue and glial tissue. On electron microscopy, the cells of the cyst wall had microvilli and abnormal cilia, and desmosome was recognized. And the cells of the cyst were bordered by a continuous basement membrane. According to pathological finding, the cyst was considered to be classified as a transitional type between chroidal epithelial cyst and ependymal cyst.