Crossed ectopia of seminal vesicles, renal aplasia and ectopic ureter

A unique case of left ureteral opening into a seminal vesicle, ipsilateral renal hyperplasia and crossed ectopia of the seminal vesicles is reported. This 24-year-old white man underwent a nephroureterectomy for relief of symptoms of lower urinary tract infection. The embryological development of this abnormality is discussed briefly.