<prompt> Whic one of the following is the most common cause of abdominal mass in neonates -NeuroblastomaWilms tumourDistended bladderMulticystic dysplastic kidneys  <response>: Ans. is d i.e., Multicystic dysplastic Kidneys Multicystic dysplastic kidney is the most common cause of an abdominal mass in the new born - Nelson o Most common abdominal mass is a neonate -- Multicystic renal dysplasia. o Most common abdominal mass in 1 months to 3 years --- Wilms tumor or multicystic renal dysplasia. o Most common renal problem in 3 to 6 years o Most common renal problem in 6 to 14 years Minimal change disease causing nephrotic syndrome. Acute post-streptococcal GN. 