Mycosis fungoides,the most common primary cutaneous lymphoma,may present with a broad spectrum of clinical features.As both clinical and dermatopathological findings in mycosis fungoides occasionally closely imitate other dermatoses,correct diagnosis may be a challenge both for clinicians as well as dermatopathologists.As a consequence,diagnosis of cutaneous lymphoma may be initially missed and,therefore,prompt and adequate therapeutic measures delayed.Hence,the purpose of our article was to give an overview of hitherto published“mimickers”of mycosis fungoides with a review of its diverse clinical features to alert the clinicians about the wide spectrum of this dissimulating disease.By integrating our own encountered atypical cases of mycosis fungoides we provide a comprehensive illustrated histological and moleculargenetic workup thereof and thereby critically revise the different available diagnostic tools of daily routine.Finally,we derive a practical algorithm to obtain the correct diagnosis even in such ambiguous cases of mycosis fungoides.