Tumors of soft tissue are more common than bone tumors. They can occur almost anywhere: within and between muscles, ligaments, nerves and blood vessels.
These tumors vary widely in how they look and behave. Some can be quite aggressive. The more the tumor has invaded nearby tissues, the harder it is to completely remove. This, in turn, increases the chances that the tumor will come back.
A sarcoma is a type of cancer that develops from certain tissues, like bone or muscle. Bone and soft tissue sarcomas are the main types of sarcoma. Soft tissue sarcomas can develop from soft tissues like fat, muscle, nerves, fibrous tissues, blood vessels, or deep skin tissues. They can be found in any part of the body. Most of them develop in the arms or legs. They can also be found in the trunk, head and neck area, internal organs, and the area in back of the abdominal cavity (known as the retroperitoneum).
Signs of a benign soft tissue tumor vary widely. If they are close to the surface of the body, they may appear as a lump. Some cause pain; others don't. They vary widely in how they look as well. If you have pain or if the tumor grows, you should see a doctor.
Smoking: Smoking tobacco is an important risk factor for kidney cancer. People who smoke have a higher risk than nonsmokers. The risk is higher for those who smoke more cigarettes or for a long time.
High blood pressure: Having high blood pressure may increase the risk of kidney cancer.
Family history of kidney cancer: People with a family member who had kidney cancer have a slightly increased risk of the disease. Also, certain conditions that run in families can increase the risk of kidney cancer.