[Cyst of the seminal vesicle with ipsilateral kidney agenesis].

Unilateral cyst of the seminal vesicle, ipsilateral ectopic ureter and ipsilateral renal agenesis are the components of a rare congenital abnormality affecting the male urogenital tract. The clinical picture is characterized by a retrovesical cystic tumor which may be asymptomatic or cause nonspecific symptoms. Differential diagnosis includes cysts of the Müllerian duct, the urogenital sinus/ejaculatory duct, and the prostate. Pelvic ultrasonography is an appropriate method of investigating patients in whom this malformation is suspected, whereas more invasive radiologic procedures are indicated in selected cases only. Treatment for retrovesical cysts should be restricted to symptomatic patients. Conservative therapy may result in subjective improvement, but surgical exploration and excision of the abnormal organs is the only definitive treatment.