Question: A 64-year-old man with a history of cholelithiasis presented to the emergency department with intermittent epigastric pain followed by postprandial vomiting for 2 days. The patient began to have acute epigastric pain 2 days ago, which was described as dull, nonradiating, and occurring after meals. The pain usually lasted a few hours and resolved spontaneously. During the night before admission, he started to vomit anything he ate. The vomitus was nonbloody, nonbilious, and composed of undigested food.