<prompt> Most common malignant tumour in childhood:RhabdomyosarcomaLeukaemiaLymphangiomaNeuroblastoma  <response>: Leukemia 561-G 580 -Ghai 7th Leukemia is most common form of childhood malignancy Descending order - Leukemia Brain tumour Lymphoma Neuroblastoma Wilms tumour Soft tissue sarcoma. Most common cancer in children 1686-Nelson 17th Lymphohematopoietic 44 Nervous system 29 Embryoral 120 Connective tissue 10 