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neck lesions in teeth | chronic stomatits/gingivitis | megaesophagus | esophagitis | gastritis | ulcers | digestive tract foreign bodies | motion sickness | obstructions | intussusception | stricture (scar tissue) | hernias | neoplasia | inflammatory bowel disease | constipation | megacolon | gastrointestinal (gi) parasitism | gastrointestinal (gi) viral diseases | gastrointestinal (gi) bacterial diseases