Midface retrusion (HP_0011800) is posterior positions and/or vertical shortening of the infraorbital and perialar regions, or increased concavity of the face and/or reduced nasolabial angle. Also known as: Decreased size of midface, Flat midface, Hypoplasia of midface, Midface deficiency, Midface hypoplasia, Midface, flat, Retrusive midface, Underdevelopment of midface.