Peri-Renal Extramedullary Hematopoiesis in Primary Myelofibrosis Patient.

A 56-year-old male known to have Primary Myelofibrosis (PMF) on ruxolitinib presented with flank pain and high creatinine, MRI abdomen showed features of extramedullary hematopoiesis. Therefore, Extramedullary hematopoiesis should be considered in patient with PMF presenting with deranged renal function.