A Case Report of follicular dendritic cell sarcoma.

Follicular dendritic cell sarcoma (FDCS) is a rare malignant neoplasm originating from follicular dendritic cells. We present a case of advanced FDCS arising in the mediastinum with multiple metastases. The diagnostic complexity, aggressive clinical course, and integrative therapeutic approach involving immunotherapy and targeted therapy offer clinically relevant insights for managing this rare and challenging malignancy.