The authors report an uncommon case of torsion of an inguinal undescen
ded testis occurring in a 15-year-old child. He consulted seven days l
ater for isolated left inguinal pain. Physical examination showed a le
ft inguinal mass, and only the right testis was palpable within the sc
rotum. Sonography revealed left inguinal mass with echogenic and heter
ogeneous contents in keeping with undescended testis. The diagnoses of
testis tumor or testis torsion were suggested. Surgical exploration r
evealed a mass suggesting a testis tumor. Orchidectomy was performed.
Histological examination showed that the mass corresponded to a necrot
ic ischemic testis without tumor cells. In the light of this case, the
authors analyse the diagnostic aspects and management of torsion of a
n undescended testis.