Low-grade sarcomas contain cells that more closely resemble normal cells. Kaposi's sarcoma is a very rare sarcoma caused by the human herpesvirus 8 (HHV-8) infecting someone with a weakened immune system (such as people with HIV). Soft-tissue sarcomas are a heterogeneous group of malignant tumors of mesenchymal origin () that originate from the soft tissues rather than bone.They are classified on the basis of tissue seen on histology. Lipomas are made of fat cells and are not cancer. Soft tissue sarcomas develop in supporting or connective tissue such as the muscle, nerves, tendons, blood vessels and fatty and fibrous tissues.They commonly affect the arms, legs and trunk. maumeemom. It mostly affects adults above the age of 40 and the most common sites are the upper arm, pelvis and thigh bone. Ewing sarcoma is a rare cancer that grows in bone or the soft tissue that surrounds bone. It is used to treat soft tissue sarcoma that is only in an arm or a leg and hasn't spread anywhere else in the body. Some tumors can restrict motion, such as those found in the hip, knee, shoulder or hands. A tumor growth in the skeletal muscles is a rare condition, and it will in most cases involve a benign tumor. Diagnosing soft tissue sarcomas. Soft tissue sarcoma is a form of cancerous tumor. When this type of cancer starts in the soft tissue and the muscles around bones, it is called extraosseous Ewing sarcoma. Only about 8,000 tumors of this type occur each year in the United States, representing only about 1% of all malignant tumors. Round cell liposarcoma is a type of myxoid liposarcoma that is high grade and more likely to spread to other areas of your body. Connective tissue is a broad term that includes bone, cartilage, fat, vascular, or hematopoietic tissues, and sarcomas can arise in any of these types of tissues. Moahs surgery - removes the cancer in layers, little by little, until no cancer remains. Find more about bone cancer. Nonetheless, a large portion of the patients can be treated in a limb-sparing manner, and surgery is the mainstay of local tumor control. It is uncommon, with an average of about 670 diagnoses in the UK each year. Sometimes it's necessary to amputate an arm or leg to remove all of the cancer, but surgeons try to preserve limb function when possible. Skin lesions can occur when a sarcoma tumor breaks through the skin. While Ewing sarcoma can develop in any bone, it is most often found in the hip bones, ribs, or long bones (e.g., femur (thighbone), tibia (shinbone) or humerus (upper arm bone)). Rhabdomyosarcoma. There are only a few of the malignant tumors (muscle cancer) annually with less than one such case per one million inhabitants. Treatment was 35 radiation sessions to the right arm. Posts: 1 Joined: Apr 2010 Apr 14, 2010 - 3:51 pm. These tumors are thought to arise from "connective tissues" other than bone, such as muscle, tendon, ligament, fat, and cartilage. The most common site is adjacent to the knee, although they are also often found near the foot, ankle or hand. Developing multiple soft tissue sarcomas (STSs) is a rare process, sparsely reported in the literature to date. There may be no other signs or symptoms at first. A sarcoma may appear as a painless lump under the skin, often on an arm, a leg, the chest, or the abdomen. Gross specimen after resection of a distal femoral osteosarcoma. It is a grapefruit sized sarcoma in his arm that is growing in the muscle. As the sarcoma gets bigger and presses on nearby organs, nerves, muscles, or blood vessels, it may cause signs or symptoms, such as pain or weakness. A painless lump or mass under the skin of your arm or leg may be the first sign of a soft tissue sarcoma. I'm writing to ask for your help with finding a doctor/hospital to treat my husband. Radiation therapy. Other terms used to describe the various types of lumps include bump, nodule, contusion, tumor and cyst.Arm lumps can be caused by any number of conditions, including infections, inflammation, tumors or trauma.