BRAF inhibitor-induced panniculitis in patients treated for stage IV metastatic melanoma: a case series.

Bartlett, David J; Erie, Andrew J; Baffour, Francis I; Broski, Stephen M; Glazebrook, Katrina N · Skeletal Radiol · 2021

case_series · Level IV

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Abstract

BRAF and MEK inhibitor combination therapy is the standard treatment for patients with BRAF V600E mutant metastatic melanoma. Neutrophilic panniculitis is a known rare complication of BRAF inhibitor therapy and can act as a potential mimic of melanoma metastases on <sup>18</sup>F-FDG PET/CT. In this case series, we present three cases of BRAF inhibitor-induced panniculitis in patients being treated for BRAF-mutant metastatic melanoma and emphasize the use of ultrasound to differentiate between panniculitis lesions, which are typically ill-defined echogenic masses and subcutaneous soft tissue melanoma metastases, which present as hypoechoic vascular masses.

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