Hoover's sign (pulmonary)

Hoover's sign in pulmonology is one of two signs named after Charles Franklin Hoover (1865–1927), an American physician based in Cleveland. It refers to the paradoxical inward movement of the lower rib cage, particularly the costal margins, during inspiration, instead of the normal outward expansion. The sign is most commonly associated with COPD and indicates altered chest wall mechanics due to lung hyperinflation.

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