Follicular dendritic cell sarcoma presenting as colonic intussusception.

Follicular dendritic cell sarcoma (FDCS) is a rare intermediate grade sarcoma involving a variety of nodal and extra nodal sites. It has two histological subtypes, conventional and inflammatory pseudotumour like variant. We report this interesting case of FDCS presenting colonic intussusception at Shifa International Hospital, Islamabad, Pakistan. Conventional FDCS presenting as a colocolic intussusception is an unusual presentation, and to our knowledge, has never been reported previously. It has wide morphological spectrum on light microscopy and has characteristic immune-reactivity for dendritic cell markers (CD21, CD23, and CD35). Surgical excision is required in all cases while role of adjuvant chemotherapy and radiotherapy is not clearly demonstrated in literature.