Renal agenesis: report of an interesting case.

Renal agenesis is generally thought to result from a lack of induction of the metanephric blastema by the ureteral bud, which may be secondary to ureteral bud maldevelopment and/or to a problem with the formation of the mesonephric duct. Uncommonly, post-natal involution of multicystic dysplastic kidneys results in solitary kidney. Unilateral renal agenesis may be associated with ipsilateral genitourinary anomalies and VATER abnormalities. The interest of this case lies in the association of unilateral renal agenesis with the presence of an ipsilateral pelvic dilated ureter, ipsilateral seminal vesicle hypoplasia and absence of the vas deferens.