Extramedullary hematopoiesis - adrenal
Known hemoglobin H-constant spring (Hb H-CS) thalassemia with right abdominal discomfort
Contrast enhanced CT abdomen pelvis
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There is a well circumscribed heterogeneous large right adrenal mass measuring 6.7 x 6.7 x 9.1 cm (AP x ML x CC). It has central necrosis. The soft tissue component demonstrates enhancement on the portovenous phase. No calcification or fatty component within. No surrounding fat streakiness.
On coronal images, it causing mass effect onto the right kidney.
Hepatosplenomegaly and cholelithiasis.
Impression: Right adrenal mass with underlying hematological disorder suggestive of extramedullary hematopoietic tumor.
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Ultrasound guided biopsy of the right adrenal mass was performed.
Histopathological examination revealed proliferation of erythroblasts, myeloblasts and megakaryocytes, along with red blood cells and haemosiderin-laden macrophages. Findings consistent with adrenal extramedullary haematopoiesis.
Extramedullary hematopoiesis (EMH) is a compensatory mechanism in response to an imbalance between bone marrow erythropoiesis and circulatory blood demand. It occurs most often due to hemolytic anemias e.g. thalassemia, hereditary spherocytosis, and sickle cell disease.
Adrenal EMH tumor should be considered in thalassemic patients with an adrenal mass, thus avoiding unnecessary surgical procedures.