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Myeloid sarcoma is a rare hematological disorder that presents as an extramedullary mass of immature myeloid precursors. We herein present the case of a 57-year-old man with a seven-month history of progressive weakness in the right upper extremity. Reconstruction magnetic resonance neurography showed a marked enlargement of the right brachial plexus. Fluorodeoxyglucose positron emission tomography revealed a radioactive lesion in the sacrum, in addition to the right brachial plexus, and a biopsy of the sacrum revealed myeloid sarcoma. The brachial plexus lesion was also regarded as myeloid sarcoma because of the treatment response. Isolated myeloid sarcoma involving the brachial plexus is very rare and its diagnosis is difficult as there was neither a history of leukemia nor bone marrow involvement in this patient. In this case, reconstructed magnetic resonance neurography was useful for detecting the brachial plexus mass lesion which led to an early diagnosis and good recovery.

Brachial Plexus Involvement of Myeloid Sarcoma Detected by Reconstruction Magnetic Resonance Neurography