Two cases of giant cell tumours of the orbit: one case of giant cell tumor associated with Paget's disease of bone and one case of tenosynovial giant cell tumor.

Giant cell tumors (GCT) are a rare group of fibrohistiocytic neoplasms that may originate from bone or soft tissue. They are typically found in the extremities or trunk and are rarely reported in the head and neck. While they are benign, they may grow rapidly and be locally destructive. To our knowledge, only three case reports of giant cell tumors of soft tissue involving the orbit have been reported in the literature. We report two cases: one case of giant cell tumor associated with Paget's disease of the bone and one of tenosynovial giant cell tumor.