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Extramedullary Involvement of Mast Cell Leukemia Detected by 18F-FDG PET/CT
Zhanli Fu1, Jin Zhang, Meng Liu
1From the *Department of Nuclear Medicine, Peking University First Hospital; †Department of Nuclear Medicine, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China; and ‡Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
Abstract:
Mast cell leukemia (MCL) is a very rare subtype of systemic mastocytosis, characterized by the leukemic expansion of immature mast cells. We present a case of MCL with extramedullary involvement of cervical lymph node and lung demonstrated by the initial F-FDG PET/CT scan. After a transient complete remission by induction chemotherapy and allogeneic hematopoietic stem cell transplantation, the follow-up PET/CT showed extensive extramedullary relapse involving multiple lymph nodes and small bowel. F-FDG PET/CT may be a useful tool to comprehensively stage and follow-up MCL.
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