[Mega-poly-calicosis. Apropos of a case with prenatal and postnatal diagnosis]. / Mégapolycalicose. A propos d'un cas avec diagnostic anté-natal et postnatal.

We report the first published case of megapolycalicosis with prenatal ultrasound diagnosis. Pyeloureteral junction dysplasia was observed only after delivery. The etiopathogenesis of megapolycalicosis (MPC) and its hypothetical association with uretero-pelvic junction obstruction are discussed. Presence of polycalicosis, good glomerular filtration and absence of compensatory controlateral renal hypertrophy are determinant in the diagnosis.