Normal anteroposterior (AP) diameter ranges from 1:2 to 5:7. An increase in AP diameter of the chest that is characterized by displacement of the sternum forward and the ribs outward is indicative of
a. a funnel chest.
b. a pigeon breast.
c. a barrel chest.
d. Harrison's groove.
C
Normal ratio of anteroposterior diameter to lateral diameter ranges from 1:2 to 5:7. A barrel chest is characterized by displacement of the sternum forward and the ribs outward and is suggestive of chronic obstructive pulmonary disease. Funnel chest, pectus excavatum, creates a pit-shaped depression. Pigeon chest, pectus carinatum, causes an increase in anteroposterior diameter. Both are related to restrictive pulmonary disease. Harrison's groove, a rib deformity, is a result of rickets.
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