This is a rare case of WS after surgery in patients with small AML.
Renal Angiomyolipoma (AML), a benign mesenchymal tumor, is the most frequent cause of WS.
Ten million people worldwide have such lesion.
We have reported a rare case of WS due to rupture of small AML after five days from colorectal surgery.
We suppose that the breaking of the lesion was favored by bridging therapy with low-molecular weight heparin.