"inferior displacement of the band from the hiatus (e.g. greater than 35 mm)."
"the 'O' sign is seen on AP views, which represents the gastric band being visible end on; this is highly suggestive of posterior band slippage 4"
"Phi angle: the angle between the vertical axis and the gastric band in AP view 6"
"Phi angle: the angle between the vertical axis and the gastric band in AP view 6"
Expected headings
"Fluoroscopy"
"the 'O' sign is seen on AP views, which represents the gastric band being visible end on; this is highly suggestive of posterior band slippage 4"
"inferior displacement of the band from the hiatus (e.g. greater than 35 mm)."
"increased gastric pouch volume (e.g. size greater than 55 cm3 )"