摘要Poland syndrome(PS)is a rare congenital condition characterized by unilateral absence or underdevelopment of the pectoralis major muscle,frequently accompanied by breast and chest wall anomalies.We report the case of an 18-year-old Chinese female diagnosed with PS complicated by contralateral macromastia who presented with significant breast asymmetry.Magnetic resonance imaging revealed a left breast volume of 618.90 mL and a right breast volume of 1 137.04 mL.The patient underwent a staged reconstruction that included a right breast reduction mammaplasty and three sessions of autologous fat grafting to the left breast.Postoperative imaging 3 months after the final procedure confirmed near symmetry,with volumes measuring 831.37 mL(left)and 841.07 mL(right).The clinical follow-up demonstrated stable results and no complications.This case un-derscores the importance of individualized surgical planning,precise volumetric assessment,and the role of fat grafting in achieving satisfactory aesthetic outcomes in patients with PS and complex breast deformities.