Pathologic Diagnosis of Cutaneous Lymphomas.

Primary cutaneous lymphomas comprise a prognostically heterogeneous group of lymphocytic skin neoplasms, which display a broad spectrum of clinical, histologic, immunophenotypic, and genetic features. The histopathological examination plays an essential role and is often the starting point in the diagnostic workup of cutaneous lymphomas. In most cases, the histopathological and the phenotypic analysis alone are limited to provide a list of differential diagnoses. As a consequence of overlapping clinical, histologic, phenotypic, and genetic features among several entities of cutaneous lymphomas, the clinicopathological correlation is of utmost importance to achieve the final diagnosis.