Gingival metastasis of a radiotherapy-induced breast angiosarcoma: diagnosis and multidisciplinary treatment achieving a prolonged complete remission.

Angiosarcoma is a rare and highly malignant mesenchymal tumor. Similar to other soft tissue sarcomas, it may arise in any organ, although it occurs more frequently within skin structures like the scalp. Angiosarcoma has a characteristic pattern of local and distant relapse involving primary site, regional lymph nodes, and lung.