"an upper GI study with water-soluble contrast medium is not usually the primary study for detection of a suspected gastric or duodenal perforation but can be useful for confirmation of an equivocal appearance on CT or for detection of the precise location of a small perforation"
"tracking pneumoperitoneum toward a region of bowel: if gas is in the upper abdomen, upper GI perforation is more likely, meanwhile, if gas is found within the pelvis, perforation is more likely to be colon or less frequently, small bowel 1; if gas is extraperitoneal, the perforation site is likely to be retroperitoneal 1"
"upper GI perforation tends to present with a relatively large volume of free fluid and less pneumoperitoneum"
"the presence of pneumoperitoneum in the periportal region is also suggestive of upper GI perforation 6"
Expected headings
"Fluoroscopy"
"tracking pneumoperitoneum toward a region of bowel: if gas is in the upper abdomen, upper GI perforation is more likely, meanwhile, if gas is found within the pelvis, perforation is more likely to be colon or less frequently, small bowel 1; if gas is extraperitoneal, the perforation site is likely to be retroperitoneal 1"
"tracking pneumoperitoneum toward a region of bowel: if gas is in the upper abdomen, upper GI perforation is more likely, meanwhile, if gas is found within the pelvis, perforation is more likely to be colon or less frequently, small bowel 1; if gas is extraperitoneal, the perforation site is likely to be retroperitoneal 1"