Granulomatosis with poliangiitis mimicking testicular torsion.

Granulomatosis with polyangiitis (GPA) is an autoimmune vasculitis which rarely affects the lower genitourinary tract. We share the case of a 53-year-old man who presented with a retroperitoneal mass and thereafter developed a left multiseptated hydrocele that conditioned a testicular infarction. The pathology report of the orchidectomy was consistent with GPA.