<prompt> 1 year old child with abdominal mass with calcification,possiblities are -a Neuroblastomab Wilms tumorc Nephronophthsisd Pheochromocytomaacabadbc  <response>: Neuroblastomas are most common malignant tumours in infancy. Stippled calcification is quite common in the tumour. They present with abdominal mass.Usual age for diagnose of Wilms tumour is 4 months to 6 yrs., median being 3 yrs. Most common presentation is painless abdominal mass. Calcification seen in 5-10 of cases. 