Retroperitoneal follicular dendritic cell sarcoma in a young woman: Diagnosis and treatment challenges.

Introduction: Follicular dendritic cell sarcoma (FDCS) is an uncommon tumor that usually arises in lymph nodes, especially in the cervical, mediastinal, or axillary areas, but rarely in extranodal sites. Few cases have been reported in English literature so far. The scarcity may be partially due to under-recognition of this entity.