First point, in my experience Physicians in the UK welcome input from patients about their conditions. They are often insightful, expedite management, and enrich the expereince for all. Now, I'm singing to the choir here I know... but it's normal to repeat scans if someone isn't diagnosed and is deteriorating. The article implies previous PET scan was done, but lesion not yet visible. Follow up scan was performed because diagnosis not resolved +/- insurance issues +/- spouse pressure. Lesion found, diagnosis made.