Spontaneous in utero second-trimester resolution of isolated mild fetal megalourethra

Congenital megalourethra is a rare disorder characterized by the congenital deficiency of the mesodermal tissues of the phallus (corpus spongiosum and corpus cavernosum), leading to enlargement of the penile urethra. We report a case of spontaneous in utero resolution of isolated congenital megalourethra diagnosed in the second trimester. Transabdominal 2- and 3-dimensional sonography showed fusiform cystic dilatation of the penis without any sign of hydronephrosis. The male neonate was delivered at term, and at clinical examination, the penis appeared normal in size and form.