Follicular Dendritic Cell Sarcoma of Appendix Presenting as Acute Appendicitis: An Exceptionally Rare Case Report.

Follicular dendritic cell sarcoma (FDCS) is a rare neoplasm that originates from dendritic cells of lymphoid follicles and shows low to intermediate malignant potential. It most commonly arises from lymph nodes, but may originate from a variety of extranodal sites. FDCS of appendix is exceptionally rare, and only a single case has been reported. Herein, we describe the clincopathological features of a case of FDCS originating from appendix with emphasis on being able to recognize this rare neoplasm in the context of the differential diagnosis of more common intraabdominal spindle cell tumors.