<prompt> A 4 years old girl presented with abdominal lump. Bone scan is needed in ___Wilms tumorNeuroblastomaRhabdomyosarcomaPNET  <response>: Neuroblastoma is the most common intra-abdominal solid tumor in children.The patient can present with an abdominal lump.Metastasis occurs in 60-70 children,usually to the skeletonfacial bones,skull,bone marrow.Therefore bone scan is needed in this case. Reference:Essential pediatrics-Ghai,8th edition,page no:616,617. 