Angiomyolipoma is a benign kidney tumour. Its extrarenal, retroperiton
eal site is exceptional. The authors report a case and emphasise the v
alue of ultrasonography and computed tomography in the diagnosis of th
ese tumours with a marked fatty component, without neglecting the cont
ribution of arteriography which can be useful in the diagnosis of the
origin of very large retroperitoneal tumours.