Abdominal masses (Neuroblastoma, Wilms, Hepatoblastoma, Rhabdomyosarcoma)

#1 most common abdominal malignancy:

#2 Wilms tumor

#3 Hepatoblastoma

(Most common abdominal tumors in teens: NHL, Rhabdo, germ cell tumors)

Other malignant abdominal masses include:

Most abdominal masses are not malignant.

Ultrasonography readily differentiates most of these benign masses from malignant ones and is the initial imaging study of  choice in children who have abdominal masses.

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Brodeur GM, Castleberry RP. Neuroblastoma. In: Pizzo PA, Poplack DG,
eds. Principles and Practice of Pediatric Oncology. 3rd ed.
Philadelphia, Pa: Lippincott-Raven; 1997:761-797
Castleberry RP. Biology and treatment of neuroblastoma. Pediatr Clin
North Am. 1997;44:919-937