Right pneumonectomy for resection of a posterior mediastinal follicular dendritic cell sarcoma arising from Castleman's disease.

Follicular dendritic cell sarcoma is a rare malignant neoplasm of immune accessory follicular dendritic cells and may be associated with Castleman's disease which is a known precursor to follicular dendritic cell sarcomas. We report a case of a follicular dendritic cell sarcoma arising in Castleman's disease in a 63-year-old man who presented with a large posterior mediastinal mass, which required a radical pneumonectomy for complete resection.