Neurosarcoma is a rare type of tumor that develops in the nervous system. It is also known as malignant nerve sheath tumor, malignant peripheral nerve sheath tumor, neurogenic sarcoma or peripheral nerve sheath tumor. These tumors are often found in the arms, legs, or torso and can cause weakness, pain, numbness, and tingling. Though rare, they can be dangerous and require prompt treatment. Some synonyms for neurosarcoma include neurogenic neoplasm, nerve cancer, malignant tumor of the nerve sheath, and peripheral nerve neoplasms. It is important to consult a doctor if you experience any unusual symptoms or have concerns about a possible neurosarcoma.