Sorry, but I have to chime in here. I spent 20 years as a litigation attorney, including defense of medical malpractice cases. Nobody should be expressing views on whether or not anybody has a claim for malpractice here. Those are considerations vastly too complex for this forum, and are dependent on facts none of us possesses at this point.
I was visiting my ENT annually and having a scope done, due to sleep apnea related issues. It was about 6 months from the time of my last exam with him until the time the anesthesiologist discovered my tumor, about 2 cm. Did I have a claim? Maybe yes, maybe no. It was more important to me to devote my energies to treatment, revcovery and living the best life I could. I know my ENT was shaken by the diagnosis, and may well fear a suit, but that's not where my head is.
Sorry, but we shouldn't practice either medicine or law on these forums.