The importance of differentiating between mycosis fungoides with CD30-positive large cell transformation and mycosis fungoides with coexistent primary cutaneous anaplastic large cell lymphoma

To the Editor: The coexistence of primary cutaneous anaplastic large cell lymphoma (C-ALCL) with mycosis fungoides (MF) can be difficult to distinguish from CD30-positive large cell transformation (CD30+LCT) of MF and requires meticulous clinicopathologic correlation. 1 Willemze R. Jaffe E.S. Burg G. et al. WHO-EORTC classification for cutaneous lymphomas. Blood. 2005; 105: 3768-3785 Crossref PubMed Scopus (3023) Google Scholar , 2 Benner M.F....