Abdominal tumors in infancy and childhood.

Detection of an abdominal mass in a child is an alarming finding for both parent and practitioner. Diagnostic studies including ultrasonography, computed tomography, and magnetic resonance imaging provide an accurate diagnosis in most cases. The current treatment of Wilms' tumor results in an 85% to 90% survival. Hepatoblastoma and neuroblastoma often present in an advanced stage and require preoperative chemotherapy before resection is attempted. Improved survival for children with these tumors awaits better detection, chemotherapy, and understanding of the biology of their growth.