| Summary: | In this paper, we bring hope to patients with mycosis fungoides (MF) with CD30+ large‐cell transformation (LCT), which is often a histological marker of poor prognosis and is associated with a mean 5‐year survival of <20%. Although skin biopsy is a painful procedure, it is the only test for early diagnosis of LCT. Stage IIB has a significantly worse 5‐year survival rate compared with stage IB/IIA, which often plagues clinicians regarding appropriate treatment selection. In this case, the discovery of LCT by skin biopsy prompted treatment with BV. Thus, proactive rebiopsy is important so that CD30+ LCT is not overlooked in the early stage of MF.
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