患儿男，16天。因发现颈部肿块16天于1997年12月19日入院。患儿系第2胎足月顺产。生后一般情况好，无窒息史。于生后即发现颈部有一肿块，约2．8cm×3．2cm，初步诊断为良性肿瘤（畸胎瘤）。当时考虑患儿小，手术危险性大，嘱暂时观察。至生后16日其母发现患儿在吸乳时呼吸增快 Children male, 16 days. Because of the discovery of cervical mass 16 days in December 19, 1997 admission. Children born in the second full-term fetus. After birth, the general situation is good, no history of asphyxia. Found in the neck that a lump, about 2.8cm × 3.2cm, a preliminary diagnosis of benign tumors (teratoma). At that time consider children with small, dangerous operation, Zhu temporary observation. To her mother found that 16 days after birth, breathing faster when breast-feeding