Primary cutaneous anaplastic large cell lymphoma

Definition

Primary cutaneous anaplastic large cell lymphoma (C-ALCL) is a rare T-cell non-Hodgkin lymphoma that affects the skin and generally shows no extracutaneous involvement at presentation. It belongs to the spectrum of primary cutaneous CD30+ lymphoproliferative disorders along with lymphomatoid papulosis with which it shares overlapping clinical and histopathologic features.