I didn't have a "clean" MRI for over a year post Tx. The reading radiologist dutifully reported every anomoly no matter however slight. The H&N surgeon had the ultimate say and it was invariably against the scan results. Scans are an important tool but only a part of the diagnostic or follow-up monitoring process. They caused me much angst in the first year, especially since I wanted to hear the words "no evidence of cancer" and "complete response" (CR) to treatment.