Cutaneous T-cell lymphomas in the revised 4th edition of World Health Organization classification of tumors of hematopoietic and lymphoid tissues (2017).

Recently, the World Health Organization published the revised 4th edition of its classification of tumors of hematopoietic and lymphoid tissues. The present paper is a concise comparative review of the main primary cutaneous T-cell hematopoietic tumors, with emphasis on their immunohistochemical profiles.