Uncommon renal perihilar extramedullary haemopoiesis causing renal impairment.

A 74-year-old man with myelofibrosis on the background of myelodysplastic syndrome/myeloproliferative neoplasm was admitted for progressive decline of the renal function and progressive tiredness. CT of the abdomen was performed showing a soft tissue lesion seeming to encase the left renal hilum and