- Sarcoma
- Arise from endothelial cells
- Include
- Scalp in older adults
- Breast or chest wall after therapeutic radiation for breast ϲanϲеr
- An extremity in conjunction with chronic lymphedema Stewart-Treves Syndrome
- Deep soft tissues
- Liver or spleen
- Heart or large vessels.
- Usually high grade and not responsive to treatment.
- Is commonly caused by therapeutic radiation - especially for breast cancer or Hodgkin lymphoma
