The adaptation of a neuroendoscopic sheath to a Leksell stereotactic frame to make it suitable for approaching small ventricles: a technical note.

Efficient endoscopic surgery in cases involving small ventricles is difficult but possible. The authors describe a neuroendoscopic sheath that has been improved to make it suitable for use with a Leksell stereotactic frame, which enabled us to accurately insert a stereotactic needle into the small ventricle and provided an adequate surgical corridor. A biopsy was performed on a 6-year-old girl who had a primary central nervous system lymphoma in the pineal body without hydrocephalus.