Narrow chest HP:0000909 UMLS:C0426790 Narrow chest HP:0005252 Narrow shoulders HP:0006588 HP:0000774 SNOMEDCT_US:249671009 Low chest circumference Reduced width of the chest from side to side, associated with a reduced distance from the sternal notch to the tip of the shoulder. Reduced anterior-posterior chest diameter Narrow thorax Thoracic hypoplasia