Solitary hyoid plasmacytoma with unicentric Castleman disease: A case report and review of literature.

Background: Solitary plasmacytoma and unicentric Castleman disease (UCD) are rare lymphoproliferative disorders characterized by monoclonal plasma cells and a single set of locally enlarged lymph nodes, respectively.

Case Summary: A 48-year-old Han Chinese man presented to our department with a neck mass and progressive foreign body sensation in his throat. F-FDG positron emission tomography revealed focally increased radioactivity centered around the hyoid, and computed tomography (CT) revealed osteolytic lesions.