[Neuroblastoma with muscular localization: description of a case]

An unusual case of abdominal neuroblastoma, whose extension involved the psoas muscle, leading to an ultrasonographic and Magnetic Resonance imaging simulating an haematoma, is described. Histology disclosed the malignant nature of the muscle mass. The Authors discuss the value of the new imaging techniques and in particular of Magnetic Resonance in the diagnostic work-up of paediatric malignancies.