The unauthorized doctor is Gwen Korovin, a throat specialist to the stars AKA fame slut. Article and photos here of very plastic-surgeried doctor:
http://radaronline.com/exclusives/2014/09/joan-rivers-death-doctor-gwen-korovin-selfie/
She looks like the lady that had plastic surgery to look like a "Weird mutant cat thing".....
I dont understand why Joan Rivers took this woman to Yorkville Endscopy with her..an ENT would have already looked at her vocal chords with a camera through the nose and would have seen the polyp immediately and she would have been taken to the hospital to get the biopsy done, I just don’t get what this doctors connection to Yorkville is