A Case of Extramedullary Hematopoiesis Presenting as a Lung Mass in a Patient with Primary Myelofibrosis.

Kim, Yeo Myeong; Kim, Hyeon Tae; Noh, Geum Youb; Kang, Min Soo; Chang, Yoon Hwan; Kim, Hye Ryoun; Lee, Jae Cheol; Kim, Cheol Hyeon

doi:2009.67.3.244

Tuberc Respir Dis > Volume 67(3); 2009 > Article

Case Report

Tuberculosis and Respiratory Diseases 2009;67(3):244-248.
DOI: https://doi.org/10.4046/trd.2009.67.3.244 Published online September 1, 2009.

A Case of Extramedullary Hematopoiesis Presenting as a Lung Mass in a Patient with Primary Myelofibrosis.

Yeo Myeong Kim, Hyeon Tae Kim, Geum Youb Noh, Min Soo Kang, Yoon Hwan Chang, Hye Ryoun Kim, Jae Cheol Lee, Cheol Hyeon Kim

¹Department of Internal Medicine, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences, Seoul, Korea. cheol@kcch.re.kr
²Department of Laboratory Medicine, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences, Seoul, Korea.

Abstract

Primary myelofibrosis is characterized by replacement of bone marrow with fibrotic tissue and the development of extramedullary hematopoiesis. Extramedullary hematopoiesis primarily involves the spleen and liver, but can also occur in the lungs. We report the case of an 80-year-old male who was admitted for evaluation of a lung mass and persistent thrombocytopenia. A percutaneous needle aspiration from the mass in the right lower lung showed myelopoietic cells with fatty tissue. A bone marrow biopsy revealed a hypercellular marrow with an increased number of atypical megakaryocytes. The final diagnosis was a prefibrotic stage of primary myelofibrosis leading to extramedullary hematopoiesis in the lung.

Key Words: Extramedullary hematopoiesis, Primary myelofibrosis, Lung mass