Incidence and Presenting Characteristics of Angiosarcoma in the US, 2001-2020.

Importance: Angiosarcoma is an aggressive vascular malignant neoplasm presenting either as a primary or secondary cancer, often arising after radiotherapy or in the context of preexisting lymphedema. Comprehensive data describing its incidence and presentation patterns are needed.

Objective: To describe the incidence, presenting characteristics, and change over time of angiosarcoma in the US.