Presentation of Case A 72-year-old woman was admitted to the hospital because of severe abdominal pain. The patient was well and active until five days earlier, when there was the onset of severe band-like pain about the level of the umbilicus, without radiation elsewhere, accompanied by a sensation of abdominal bloating; the pain was constant and was not affected by position or antacids but increased in severity about half an hour after meals. The patient's stools became soft, with a single episode of hematochezia; after two or three days she stopped passing stools. Several days before admission the pain became. . .
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