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Course: Bright Red Macules of the Lower Legs

CME Credits: 1.00

Released: 2021-08-11

A woman in her 70s was referred to the dermatology department by the rheumatology department with concerns for vasculitis of the bilateral lower legs. She had been healthy until 6 years earlier when she had suddenly developed peripheral neuropathy, with subsequent workup revealing a diagnosis of immunoglobulin M (IgM) monoclonal gammopathy of undetermined significance. Her symptoms had rapidly progressed during the past few months. In addition to worsening neuropathy, she had developed fatigue, weight loss, and sudden altered mental status. An ischemic stroke was identified. The patient was hospitalized, and extensive diagnostic examinations and procedures were completed. A lymphoproliferative disorder with plasmocytic differentiation was detected in a bone marrow biopsy specimen, which together with the monoclonal IgM paraproteinemia was consistent with Waldenström macroglobulinemia (WM).


Educational Objective
Based on this clinical scenario and the accompanying image, understand how to arrive at a correct diagnosis.


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