Fig. 2

Neuroblastoma. Case 1. Typical neuroblastoma. The abdominal ultrasound (a) and the axial fat-saturated T2-weighted images (b) show the well-defined, homogeneous mass arising from the right adrenal gland (white arrow) and displacing the kidney in this 2-day-old baby. Case 2. Axial contrast-enhanced CT (CECT) (c) shows the enhancing retroperitoneal tumor (white arrow) originating from the organ of Zückerkandl in this 10-day-old girl. Note the hepatic infiltration (arrow). Case 3. Axial CECT (d) shows the mass arising from the right paraspinal sympathetic chain and extending into the spinal canal in this 3-day-old baby boy. Note the enlargement of the spinal canal (white block arrow). Case 4. Atypical neuroblastoma. Axial ultrasound (e) and T1-weighted images after i.v. contrast medium administration (f) show the retroperitoneal, lobulated mass infiltrating the right kidney and causing hydronephrosis (arrow) in this 5-week-old baby. The lesion was initially considered to be a renal tumor, but histology revealed neuroblastoma