Abstract

Undescended Testis is an attractive subject, appealing the attention of both biologists and pediatric surgeons. Biologists mostly deal with the reason of descent; however, surgeons are interested in the mechanism of descent. Despite not proposing a new theory Ihsan Numanoglu published an interesting paper in 1969 which was well ahead of his time demonstrating the histological abnormalities of undescended testis. It is a precious paper revealing the scientific personality of Numanoglu. This brief review of undescended testis theories is dedicated to him.