So how did things go so horribly awry?
In a bombshell revelation, a source now tells Daily News that one of Rivers’ own doctors decided to do an unplanned biopsy of a mass found on her vocal chords — a more dangerous procedure than the planned endoscopy.
The source says the biopsy should not have been allowed at the Yorkville Endoscopy clinic, a non-hospital setting.
When the doctor, who “arrived with her entourage,” performed the surprise biopsy, Rivers’ vocal chords spasmed and blocked her airway.
In the video below, a doctor discusses laryngospasm, which the Mayo Clinic describes as a “spasm of the vocal cords that temporarily makes it difficult to speak or breathe.”