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Thoracic Extramedullary Hematopoiesis Mimicking Metastatic Cancer

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Thoracic extramedullary hematopoiesis (EMH) is a rare manifestation in patients with myeloproliferative neoplasm. A 76-year-old woman with a long-standing history of polycythemia vera presented with a 2-month history of worsening dyspnea and left-sided wheezing. A chest computed tomography showed an ill-defined soft tissue mass encasing the left mainstem bronchus causing airway obstruction, associated with paratracheal and paraesophageal lymphadenopathy. Endobronchial ultrasound-guided fine needle aspiration of the soft tissue mass and mediastinoscopy with excisional biopsy of a paratracheal lymph node demonstrated EMH with increased myeloid blasts. A bone marrow biopsy confirmed postpolycythemic myelofibrosis consistent with progression of polycythemia vera to myelofibrosis. We describe the bronchoscopic management of a case of EMH presenting as a mediastinal mass, mimicking malignancy.
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Keywords: bronchial; cancer; extramedullary hematopoiesis; mediastinal mass; obstruction; polycythemia vera

Document Type: Research Article

Affiliations: 1: Division of Pulmonary, Critical Care, and Sleep Medicine 2: Department of Pathology 3: Division of Hematology-Oncology, University of California San Diego, La Jolla, CA

Publication date: October 1, 2016

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