An Unusual Presentation of Multiple Sclerotic Bone Lesions in Unicentric Castleman's Disease.

Castleman's disease is a rare lymphoproliferative disease that usually presents as a solitary mass in the mediastinal or cervical region. Castleman's disease can be usually of two types: unicentric type (which involves only one site of lymph nodes) and multicentric type (which involves multiple sites of lymph nodes). We report the case of a 26-year-old female with multiple sclerotic bone lesions in unicentric Castleman's disease. The definitive diagnosis was made by excisional biopsy with immunohistochemistry, 18F-fluoro-2-deoxy-D-glucose positron emission tomography (FDG-PET) study, and MRI scan. This case report emphasizes the need for proper workup for systemic manifestations in unicentric Castleman's disease.