Extramedullary Involvement of Mast Cell Leukemia Detected by 18F-FDG PET/CT

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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 18F-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. 18F-FDG PET/CT may be a useful tool to comprehensively stage and follow-up MCL.

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