Purpose: We examined and characterized the histological features of re
mnant testicular tissue distal to the internal inguinal ring in boys w
ho underwent exploration for a nonpalpable testis. Materials and Metho
ds: The medical records and histology of 48 boys (50 remnants) who und
erwent exploration for a nonpalpable testis during a 10-year period we
re reviewed in detail. Results: Remnant tissue was characterized by ev
idence of ischemia and necrosis (scar, calcification, hemosiderin and
hyalinization) suggestive of a vascular accident. Viable germ cells we
re identified in 5 remnants. Conclusions: A 10% incidence of viable ge
rm cells in remnant testicular tissue warrants exploration and removal
of all remnant tissue in boys who undergo exploration for a nonpalpab
le testis.