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Disease of a specific organ may be suspected from the history, directing attention to this viscus on examination. Suspicion may also have been raised during inspection and percussion. In a thin subject, it is not uncommon to palpate a number of normal viscera, including a smooth liver edge, the lower pole of each kidney, the cecum, the ascending, transverse and sigmoid colon, and the abdominal aorta. Other structures which may be misinterpreted as abnormal are: a long xiphisternum, which may extend to near the umbilicus, prominent rectus abdominus muscles, their intersections and divarication, and calcification in an old scar.