The chest with an AP diameter approximately equal to its transverse diameter is most commonly described as which chest shape seen in older adults?

The chest with an AP diameter approximately equal to its transverse diameter is most commonly described as which chest shape seen in older adults?

• A. Barrel chest
• B. Pectus carinatum
• C. Pectus excavatum
• D. Funnel chest

Answer: (A)

Barrel-shaped chest describes a front-to-back (AP) diameter that is increased so it closely matches the side-to-side (transverse) diameter, giving a round, widened appearance. This pattern is commonly seen in older adults due to aging-related changes in the chest wall and lungs, such as decreased elastic recoil and gradual hyperinflation, which roughen the chest’s contour and make the AP dimension more prominent. So describing a chest where the AP and transverse diameters are roughly equal fits this barrel shape. Pectus carinatum is a protruding sternum (pigeon chest)—a fixed deformity, not the aging-related barrel shape. Pectus excavatum (funnel chest) is a sunken sternum, another distinct deformity. These do not describe the barrel-like, increased AP diameter seen with aging.

Barrel-shaped chest describes a front-to-back (AP) diameter that is increased so it closely matches the side-to-side (transverse) diameter, giving a round, widened appearance. This pattern is commonly seen in older adults due to aging-related changes in the chest wall and lungs, such as decreased elastic recoil and gradual hyperinflation, which roughen the chest’s contour and make the AP dimension more prominent. So describing a chest where the AP and transverse diameters are roughly equal fits this barrel shape.

Pectus carinatum is a protruding sternum (pigeon chest)—a fixed deformity, not the aging-related barrel shape. Pectus excavatum (funnel chest) is a sunken sternum, another distinct deformity. These do not describe the barrel-like, increased AP diameter seen with aging.