Torsion of a malignant undescended testis mimicking appendicitis.

Testicular maldescent is known to be associated with later development of malignancy. The maldescended testis is prone to other complications--in particular, torsion. We report an unusual coincidence of both malignancy and torsion of an intra-abdominal testis which closely simulated a ruptured appendix abscess. This case demonstrates that an intra-abdominal testis can develop acute life-threatening complications which should be considered in any patient with acute abdominal symptoms who has an 'absent' testis.