Extramedullary Hematopoiesis in Adrenal Incidentaloma: Case Report of an Atypical Histopathological Finding

Adrenal gland extramedullary hematopoiesis is extremely rare, and when present, imaging studies may mimic an incidentaloma suspicious of malignancy. We present a 55-year-old woman without a history of hematologic disorder or neoplasms. There was an incidental finding of a 3.2 x 2.4-cm heterogenous adrenal mass and enhanced by contrast abdominal CT scan. Suspicious of malignancy was established, and laparoscopic left adrenalectomy was performed. Histopathological examination and immunohistochemical staining exhibited myeloid and erythroid precursors, as well as megakaryocyte confirming the diagnosis of extramedullary hematopoiesis in the adrenal gland.