Mycosis fungoides (MF) is the most common subtype of cutaneous lymphomas. The initial diagnosis of MF is often difficult, particularly in the early stage, requiring arduous clinical and pathological workups with repeat skin biopsies. Differential diagnosis ranging from benign dermatoses to other hematolymphoid neoplasms can be tricky and extremely challenging. Clinical management and treatment vary widely among providers and institutions. This book is an up-to-date overview of MF, covering almost every aspect of the disease. The chapters encompass aetiology, clinical workup and diagnosis, pathological diagnosis, clinical and pathological variants, differential diagnosis, treatment and prognosis, as well as the state-of-the-art understanding of the molecular genetics of MF. Paediatric MF and Sezary syndrome (SS) are also included for completeness in the book.