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Hemangioendothelioma is a tumor caused by abnormal growth of the cells of a blood vessel. It is a type of cancer called a sarcoma because it develops in a "soft tissue." A hemangioendothelioma can also develop in an organ, such as the liver or lung. Hemangioendotheliomas usually grow slowly and can sometimes spread into nearby tissues, or to more distant parts of the body in a process called metastasis. 
- Sarcoma - Adult Soft Tissue Cancer. American Cancer Society. http://www.cancer.org/Cancer/Sarcoma-AdultSoftTissueCancer/DetailedGuide/sarcoma-adult-soft-tissue-cancer-soft-tissue-sarcoma. Accessed February 14, 2011.
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- The American Cancer Society provides information on hemangioendothelioma in a fact sheet on soft-tissue sarcomas.
- The National Cancer Institute provides the most current information on cancer for patients, health professionals, and the general public. Click on the link to view information on this topic.
- PubMed is a searchable database of medical literature and lists journal articles that discuss Hemangioendothelioma. Click on the link to view a sample search on this topic.