title: Image of the month: A prolapsing antral polyp causing gastric outlet obstruction.
mesh_terms: D000369:Aged, 80 and over; D017219:Gastric Outlet Obstruction / Q000175:diagnosis* / Q000209:etiology; D005773:Gastroscopy; D006801:Humans; D008297:Male; D011127:Polyps / Q000150:complications / Q000175:diagnosis*; D011706:Pyloric Antrum