BACKGROUND. Nonpolypoid (depressed or flat) neoplasias are rarely seen in the colon and rectum. We previously reported their histogenesis and characteristics in patients with familial adenomatous polyposis (FAP), but their development in patients without FAP has not been studied systematically. METHODS. Three hundred specimens of large intestinal mucosa surgically resected from patients with cancers or other diseases, excluding FAP, were examined with a dissecting microscope. The morphologic types, sizes, locations, and frequencies of detectable colorectal neoplasias, and their histologic features, were analyzed. RESULTS. A total of 297 adenomas (240 polypoid, 32 flat, and 25 depressed type) were obtained. Nonpolypoid adenomas were most frequently found in the trans-
Internal hernias in which the gate is located in the paracolic gutter are rare. A 75-year-old man was admitted to our hospital with severe epigastric pain without past history of laparotomy and/or trauma. He was diagnosed with strangulation of the ileum by the findings of computed tomography, and the operation was performed. During laparotomy, the small intestine was found to be strangulated and to enter the retroperitoneum from the right paracolic gutter near the hepatic flexure. The patient was diagnosed with an internal hernia, which differed from a pericecal hernia in that the hernia gate was located along the paracolic gutter near the hepatic flexure far from the cecum. Hence, it was considered to be a rare type of internal hernia. We report the clinical presentation and imaging findings of this rare internal hernia.Key words: Internal hernia -Paracolic gutter A n internal hernia is a rare condition defined as the protrusion of abdominal viscera into one of the fossae, foramina, recesses, or congenital defects within the abdominal and pelvic cavity. Internal hernias are generally classified into 6 types: paraduodenal, pericecal, foramen of Winslow, transmesenteric, pelvic and supravesical, and intersigmoid.
1-3A pericecal hernia is a typical form of internal hernia and can be divided into 4 types: superior ileocecal recess, inferior ileocecal recess, retrocecal recess, and paracolic sulcus.2 Although our case displayed similar features to the paracolic sulcus type of pericecal hernia, it differed from a pericecal hernia in that the hernia gate was located along the right
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