Type I, (hypoplasia) underdevelopment of the lower inner (medial) fourth (quadrant); type II, (hypoplasia) underdevelopment of the lower inner (medial) fourth (quadrant) and outside (lateral) fourth; and type III, severe breast tightening and narrowing (constriction) and overall underdevelopment (global hypoplasia).
Tuberous Breast Deformity: Classification and Treatment Strategy for Improving Consistency in Aesthetic Correction
Kolker, Adam R.; Collins, Meredith S.
Plastic & Reconstructive Surgery. 135(1):73-86, January 2015.
