Mycosis fungoides and Sézary syndrome

Summary Mycosis fungoides (MF) and Sézary syndrome (SS) are the most common cutaneous T‐cell lymphomas, arising from mature CD4 + memory T cells. Diagnosis is complex and relies on clinicopathological correlation, immunophenotyping and molecular clonality testing, while management is stage‐adapted, with potentially curative outcomes achievable only in selected patients through allogeneic haematopoietic stem cell transplantation.