In 1910, L'Espinasse performed the first neurosurgical endoscopic procedure for choroid plexus electrocoagulation in an infant with hydrocephalus, by use of a cystoscope. One infant was successfully treated. Walter Dandy used an endoscope to perform an unsuccessful choroid plexectomy in 1922. The next year, Mixter, using a urethroscope, performed the first successful endoscopic third ventriculostomy in a 9-month-old girl with obstructive hydrocephalus. In 1935, Scarff reported his initial results about endoscopic third ventriculostomy using a novel endoscope. His ventriculoscope had an...