Abstract
Primary cutaneous lymphomas represent distinct clinical and histopathologic subtypes of extranodal T-and B-cell lymphomas. The EORTC classification for primary cutaneous lymphomas proposed in 1997, is based on a combination of clinical, histologic, and immunophenotypic criteria. Thus, the classification may be useful for dermatological clinicians to plan treatments. On the other hand, new WHO classification is not an organ-based classification, and some categories include both cutaneous and systemic diseases, and these may have very different prognoses. However, pathologists will try to utilize the WHO classification, and to unify diagnoses for further clinical and scientific research. The review discusses problematical areas in both WHO and EORTC classifications. [Skin Cancer (Japan) 2004; 19: 90-95]
