Mature T-cell or NK-cell lymphomas and lymphoproliferative disorders, primary cutaneous specified types
Definition
Primary cutaneous T-cell lymphomas (CTCL) and NK-cell lymphomas are malignant lymphoproliferative diseases of unknown cause that are thought to originate from T-lymphocytes in the lymphoid tissue of the skin and by definition are confined to the skin at initial diagnosis. Included in the class is also a small number of lymphoma-like primary cutaneous lymphoproliferative disorders which are not considered to be truly malignant.