Fig. 1
From: Gastroesophageal flap valve reflected EGJ morphology and correlated to acid reflux
The Hill grades of GEFV. GEFV was graded from I through IV prospectively during endoscopic examination based on the Hill classification: Grade I: The fold of tissue approximated to the endoscope closely; Grade II: The fold of tissue is less prominent than Grade I. The tissue around the endoscope could open during respiration and close rapidly; Grade III: The fold of tissue is barely prominent and the endoscope is not gripped by the tissue tightly; Grade IV: There is no prominent fold of tissue at all and a hiatal hernia is present