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

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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.

Normal Anteroposterior (AP)diameter Ranges from 1:2 to 5:7