Primary cutaneous peripheral T-cell lymphoma (not otherwise specified)

Peripheral cutaneous T-cell lymphoma which cannot be further classified due to high morphological and molecular variability are included into the group of "primary cutaneous peripheral T-cell lymphoma - not otherwise specified" (PCTL-NOS). PCTL-NOS represent a rare, heterogeneous group characterized by rapidly progressive nodules in the absence of typical mycosis fungoides plaques. Furthermore, therapeutic options are limited and prognosis is rather poor. We report on a 62-year-old patient presenting with asymptomatic papules in the popliteal and antecubital fossae. Based on histopathological criteria, PCTL-NOS was diagnosed. Based on recent gene expression studies, a positive reaction to tyrosine kinase and histone deacetylase inhibitors is hoped for. © 2011 Springer-Verlag.