If you’re not able to correctly diagnose the condition of a patient, here is a simple template you can use to write a letter to a doctor for a second opinion.
I checked up on the condition of a patient. Unfortunately, it is a medical condition I have not seen before. Thus, I am asking for your second opinion on this. I know you are expert regarding this matter. You can definitely give a diagnosis that would make me confident. I will gladly pay your consultation fee as that would be better than me giving a false diagnosis. I would not want my reputation to be ruined because of one false diagnosis.
Hope you can let me know immediately about your next free schedule so I can tell that to the patient. I know you won’t disappoint me as a lot of patients have lauded your efforts in the past.