[Splenosis: underdiagnosed entity]. / Esplenosis: una entidad infradiagnosticada.

OBJECTIVE: To report a case of renal splenosis in a patient that had previously undergone splenectomy due to traumatic rupture. METHODS/RESULTS: A 42-year-old patient consulted for pancreatitis. A CT scan disclosed a mass behind the tail of pancreas, MRI assessment with gadolinium enhancement showed a left renal mass which was surgically resected. Histopathological analysis of the surgical specimen demonstrated splenic tissue. CONCLUSIONS: Splenosis should be considered in splenectomized patients with lesions compatible with tumors and should be distinguished from hyperplasia of accessory spleens.