Clinic : ` ` A biopsy of the vocal folds has never been performed at ' Endoscopy '' Federal privacy laws limit what medical professionals can make public about patients . The clinic has state - of - the - art equipment and well - trained doctors , " , clinic says . Joan Rivers died a week after suffering cardiac arrest at the Manhattan clinic .
Clinic : `` A biopsy of the vocal cords has never been performed at Yorkville Endoscopy '' Federal privacy laws limit what medical providers can make public about patients . The clinic has state-of-the-art equipment and well-qualified doctors , nurses , clinic says . Joan Rivers died a week after suffering cardiac arrest at the Manhattan clinic .