患者,男,2岁8个月,因生后一直无牙,并伴有无汗,稀纤发,于1987年4月27日入院。孕期良,第2胎足月顺产,生后头皮菲薄,韧红,有稀纤黄发均匀分布。生长发育尚正常,平素寡言少动无汗,热天好在阴凉处站立;曾无明显诱因发热3～4次,以感冒治疗,用退烧药无汗。近期因一直无牙在当 Patient, male, 2 years old and 8 months old, has been toothless since birth and accompanied by sweaty, thin hair, was admitted on April 27, 1987. Good during pregnancy, the second full-term pregnancy, after birth, scalp meager, tough red, thin yellow hair evenly distributed. Growth and development is still normal, usually less retreat with no sweat, hot days stand in the shade; had no obvious incentive to fever 3 to 4 times, to cold treatment, anti-fever drugs without sweat. Recently because of no teeth in the past