患者　女 ,5 4岁。因左前胸部肿块进行性增大 3个月、疼痛 15天入院。查体 :全身浅表淋巴结未触及肿大 ,左前胸部第3、第 4肋间胸骨旁有一 2 cm× 4.5 cm大小、质硬、固定、有压痛的肿块。胸部 CT示 :左胸壁包块 ,边界不清 ,与胸膜无明显粘连 ,术前病理诊断 :原始神经外胚叶瘤 Female patient, 5 4 years old. The left frontal breast mass was progressively enlarged for 3 months and the pain was admitted for 15 days. Physical examination: The body’s superficial lymph nodes did not reach enlargement. There was a 2 cm × 4.5 cm size, rigid, fixed, tender mass near the 3rd and 4th intercostal space of the left anterior chest. Chest CT showed: left chest wall mass, unclear border, no obvious adhesion with pleura, preoperative pathological diagnosis: primitive neuroectodermal tumor