Castleman disease (CD) is a benign lymphoproliferative disorder that may present as a localized or multicentric form (see these terms). The clinical manifestations are heterogeneous, ranging from asymptomatic discrete lymphadenopathy to recurrent episodes of diffuse lymphadenopathy with severe systemic symptoms.

A systemic disease which can present with cutaneous lesions with or without internal involvement. Tumors are caused by Human herpesvirus 8 (HHV8), also known as Kaposi's sarcoma-associated herpesvirus (KSHV).