almost two years from last treatment date (3/28/01). Diagnosed stage IV left lateral oral tongue, six nodes left side of neck. 1/3 of left side of tongue removed as well as left side modified radical neck disection. now have a small (pencil eraser) size blister on right side bottom of tongue. I have always heard it to be rare for this type of cancer to spread to opposite side. Any other possible explanation besides recurrence. Not painful etc. Non smoker, light drinker