<s>[INST] my wife diagnosed with sciatic nerve shealth tumor on her distal left thigh, about 5cm. i would like to ask if this is cancerous or not. if he undergo surgery, what the chances that will not affect her legs. please reply , i love my wife im working in abroad. please give me advise [/INST] Thanks for your question on Chat Doctor. In my opinion it is mostly benign tumor. Either Neurofibroma or Schwann or ganglia. Chances of malignancy are very rare. The only treatment for this is surgical removal. So better to get done surgical removal and histopathological examination of tumor. This will give us confirm diagnosis. And the surgery for this is very simple. Done under local anesthesia.  So very fewer chances of complication. </s>