Newborn boy with a right abdominal mass detected on prenatal ultrasound. Initial AXR is unremarkable with a nonobstructive bowel gas pattern.
Ultrasound examination shows a multicystic mass in the right renal fossa and a normal left kidney.
Multicystic dysplastic kidney is one of the commonest causes for a neonatal abdominal mass. Bilateral involvement is incompatible with life, associated with severe pulmonary hypoplasia and maternal oligohydramnios. Most MCDK are left alone, and they often become smaller, although some remain the same size or even grow on follow up. If renal scintigraphy is performed, MCD kidney will show no uptake or excretory function. All rights reserved.