گزارش یک مورد توده کلیوی ناشی از خون‌رسانی خارج مغز استخوان در یک بیمار مبتلا به استئوپتروز

Extramedullary hematopoiesis is an extension of marrow beyond its bony casement. It is associated with a number of diseses when the normal function of marrow is disturbed. A large accumulation of extramedullary hematopoiesis may occur at the paravertebral area, mediastinum, spleen and liver. Intrarenal extramedullary hematopoiesis is rare.Only a few cases have been reported of myelofibrosis and idiopathic thrombocytopenic purpura. We report a cases of intrarenal extramedullary hematopoiesis that mimicked a renal tumor. A 23 year-old man which is known case of osteopetrosis presented with pancytopenia and abdominal mass.