Fig. 1

Radiological and intraoperative findings of the lesion. T2-weighted coronal MRI of the abdomen shows a heterogeneous mass (yellow arrows) that is slightly hyperintense to muscle between the inferior vena cava (IVC, blue arrows) and the head of the pancreas. The supra mesenteric vein (SMV, green arrows) runs ventrally near the tumour (a). MIBG scintigraphy reveals a strong accumulation at the same location detected on MRI (b). During surgery, a 30-mm tumour (yellow arrows) is found below the retroperitoneum on the caudal side of the mesocolon (c). MRI, magnetic resonance imaging; MIBG, metaiodobenzylguanidine,