Which areas of the GI tract lead to problems in the passage of foreign bodies

Which areas of the GI tract lead to problems in the passage of foreign bodies? 

Several areas of anatomic or physiologic narrowing exist along the GI lumen and may compromise the spontaneous passage of foreign bodies: cricopharyngeal muscle, extrinsic compression of the middle esophagus from the aortic arch, lower esophageal sphincter, pylorus, ileocecal valve, rectal valves of Houston, and anal sphincters. In addition, numerous pathologic abnormalities, such as strictures or tumors, may impair spontaneous passage of foreign bodies 

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