Gartner's duct cyst with unilateral renal dysplasia presenting as an introital mass in a new born.

A persistent Gartner's duct cyst associated with ipsilateral renal agenesis or dysplasia is rare. A vaginal cyst at the introitus as the presenting complaint is very rare, and has not been previously described in a neonate. Sepsis despite the presence of renal agenesis, or non- or poorly functioning renal tissue, is an indication for ureterectomy or nephroureterectomy on the affected side.