Abstract
Anaplastic large-cell lymphoma ALK-negative (ALCL, ALK-) is classified as a provisional entity in the last World Health Organization (WHO) classification and is defined as a CD30+ T-cell neoplasm that is not reproducibly distinguishable on morphological grounds from ALK-positive ALCL, but lacks anaplastic large cell lymphoma kinase (ALK) protein. Cases with cutaneous involvement must be d…