Do you know anything about perineurioma on the tongue. I was diagnosed with spindel cell neoplasm .. Kansas pathologist said it was malignant .. Sent off to Cleveland clinic. Took two weeks. Came back benign. Well I looked up this so called rare tomar and my symptoms do not match at all.... mine is not encapsulated it is very painful it is growing as a fast rate and has always... it was smaller when the doctor first did the biopsy. Days after the biopsy is started growing and has grown very fast filling up the back of my mouth. I have an appointment in a week with an ENT.