<prompt> Which one of the following is the most common cause of abdominal mass in neonatesNeuroblastomaWilms tumourDistended bladderMulticystic dysplastic kidneys  <response>: Multicystic dysplastic kidney is the most common cause of an abdominal mass in the newborn - NelsonA most common abdominal mass is a neonate Multicystic renal dysplasia.A Most common abdominal mass in 1 month to 3 years Wilms a tumour or multicystic renal dysplasia.A most common renal problem in 3 to 6 years Minimal change disease-causing nephrotic syndrome.A most common renal problem in 6 to 14 years Acute post-streptococcal GN. 