S454 Utility of High Resolution Manometry, Barium Esophagram and Endoscopic Ultrasound to Assess Length of Spastic Segment in Type 3 Achalasia. (October 2021) - Hasan, Aws; Low, Eric; Kaizer, Alex; Fehmi, Syed Abbas; Kwong, Wilson; Krinsky, Mary L.; Chang, Michael; Anand, Gobind; Greytak, Madeline; Yadlapati, Rena