<prompt> Most common cause of abdominal mass in neonates is?NeuroblastomaMulticystic dysplastic kidneyPolycystic kidneyUmbilical hernia  <response>: b. Multicystic dyspiastic kidneyRef: Nelsons 20e p 2513Multicystic dyspiastic kidneyQ is the most common cause of abdominal mass in a neonate. 