<unk>  is a group of uncommon lymphoproliferative disorders characterized by lymph node enlargement, which often manifests without any other obvious symptoms.<unk>  includes at least three distinct subtypes: unicentric<unk>  (UCD), human herpesvirus 8 associated multicentric<unk>  (HHV-8-associated MCD), and idiopathic multicentric<unk>  (iMCD). These are differentiated by the number and location of affected lymph nodes and the presence of human herpesvirus 8, a known causative agent. Correctly classifying the<unk>  subtype is important, as the three subtypes vary significantly in symptoms, clinical findings,<unk>  mechanism, treatment approach, and prognosis. In the United States, approximately 6,500 to 7,700 new cases are diagnosed each year.<unk>  is named after Benjamin<unk> , who first described the<unk>  in 1956. The<unk>  Collaborative Network is the largest organization focused on the<unk>  and is involved in research, awareness, and patient support.
Castleman disease
Kaposi's sarcoma
Ewing's sarcoma
Histiocytoma
Familial myxovascular fibromas
Bartholin's cyst
Angiomatoid fibrous histiocytoma
Progressive nodular histiocytoma