PMC5686225_01
(A) Computed tomographic scan of chest showing a 2.6 cm homogenous right paravertebral mediastinal mass (B) Posteroanterior chest radiography.
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It also incidentally identified a 2.6 cm homogenous right paravertebral (at the level of T8) mediastinal mass of soft tissue density, which did not erode the adjacent bony structure (Fig. 1A). Meanwhile, chest radiography displayed no remarkable abnormal findings except fibrotic scar on left lower lobe field (Fig. 1B).
(A) Thoracoscopic findings of extramedullary hematopoiesis at the upper margin of posterior arc of 8th rib (B) The microscopic findings of the specimen (H&E, x400). Note diffuse hematopoiesis consisting of megakaryocytes, immature granulocytic and myeloid precursor cells.
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It was located at the upper margin of posterior arc of 8th rib (Fig. 2A). A permanent histopathological examination demonstrated a normal diffuse hematopoiesis consisting of megakaryocytes, immature granulocytic and myeloid precursor cells (Fig. 2B), and confirmed a diagnosis of EMH.