例1,王某,男,18岁。因多饮多尿、生长缓慢13年入院。患者足月顺产。5岁始出现生长缓慢,多饮多尿,尿量5000～6000ml/天,逐年加重。查体:血压11.3/6.7kPa,身高138cm。外生殖器似幼儿,睾丸软。第二性征未发育。无手术及放射治疗史。尿比重1.004～1.010,禁水试验 Example 1, Wang, male, 18 years old. He was hospitalized for 13 years due to frequent drinking and diuresis and slow growth. The patient was born full-term. At the age of 5 years, it appeared to grow slowly, drink more and more urine, and the urine volume was 5000-6000 ml/day, which increased year by year. Physical examination: Blood pressure 11.3/6.7kPa, height 138cm. The external genitalia are like young children, and the testicles are soft. The second sex is not developed. No history of surgery and radiation therapy. Urine specific gravity 1.004 to 1.010, water cut test