Development of a Hodgkin disease tumor in the neck of a patient who previously had undergone complete excision of a hyaline-vascular Castleman disease neck mass.

Castleman disease is an uncommon cause of a neck mass. A benign lymphoproliferative disorder, it may be seen as a self-limited unicentric process or as a fulminant multicentric disease with systemic symptoms. The association between Hodgkin disease and Castleman disease has been debated extensively, but this association is rare.