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→Plain radiography
===Plain radiography===
===Plain radiography===
[[Image:Gastric ulceration.png|thumb|right|250px|Gastric Ulceration - Copyright David Walker RVC]]
[[Image:Gastric ulceration.png|thumb|right|250px|Gastric Ulceration - Copyright David Walker RVC]]
Not usually diagnostic but rules out differentials.
Not usually diagnostic but can rule out differentials such as foreign bodies and peritonitis.
===Positive contrast radiography===
===Positive contrast radiography===