Ultrasound: first mandatory step in diagnosis of abdominal masses in children.
D000008:Abdominal Neoplasms / Q000175:diagnosis*; D001706:Biopsy; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis / Q000473:pathology; D007223:Infant; D007231:Infant, Newborn; D007680:Kidney Neoplasms / Q000175:diagnosis / Q000473:pathology; D008297:Male; D012189:Retrospective Studies; D014463:Ultrasonography; D009396:Wilms Tumor / Q000175:diagnosis / Q000473:pathology