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The costal margin, also known as the costal arch, is the lower edge of the chest (thorax) formed by the bottom edge of the rib cage.
The thoracic diaphragm attaches to the costal margin.
The costal angle is the angle between the left and right costal margins where they join the sternum.
Different Abdomen may be Palpation just below the costal margin, such as the liver on the right side of the body.
Pain across the costal margin is most commonly caused by costochondritis.
The costal paradox, also known as Hoover's sign and the costal margin paradox, is a sign where the costal angle decreases upon Breathing rather than increasing, indicating chronic obstructive pulmonary disease.
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