[Peritoneal splenosis simulating a right retroperitoneal mass]

We report a case of an incidentally diagnosed apparently isolated splenosis nodule located in the hepatorenal peritoneal recess. According to imaging features, this mass was a non-renal retroperitoneal tumor. In spite of the isolated location, the history of splenic rupture should have led to a heat-damaged red blood cell scintiscan and would thus have avoided percutaneous biopsy.