1　临床资料　某女,45天。出生后即发现左耳廓大部离断,仅耳垂部分约0.5ｃｍ相连,耳屏、外耳道均正常,耳廓大部耳软骨发育良好,耳根处较健侧为短,外耳轮,对耳轮发育良好,对耳轮上脚缺失,耳甲腔小,耳根后有少许瘢痕。入院后经追问病史,其母诉怀孕3个月余时曾有腹部外伤史,否认孕 1 clinical data a woman, 45 days. After birth, most of the left auricle was severed. Only the part of the earlobe was connected with a distance of about 0.5cm. The tragus and external auditory meatus were all normal. Most of the ear auricles developed well, while the auricles were shorter than the healthy ones. Good, the missing ear on the ear, ear cavity small, a little scar after the root. After admission by medical history, his mother said the mother had a history of abdominal trauma when pregnant more than 3 months, denied pregnancy