Subependymal giant-cell astrocytoma. Case report with ultrastructural study.

A 13-year-old boy presented with an obstructive left lateral intraventricular mass. Pathological examination revealed a subependymal giant-cell astrocytoma. Further clinical investigation confirmed the diagnosis of tuberous sclerosis. Ultrastructural examination confirmed previously reported features of this tumor. Tumor cells containing large dense granulated bodies and dense-core vesicles, not previously described in this tumor, were identified.