尿路拡張を伴った腎性尿崩症の2例

NEPHROGENIC DIABETES INSIPIDUS WITH DILATATION OF THE URINARY TRACT: A REPORT OF TWO CASES

　症例1は5歳，男児。夜尿症が主訴。著明な尿路拡張をきたしており，膀胱造影ではpine-tree appearanceを呈した。症例2は23歳，男性。口渇，多飲多尿が主訴。幼少時に腎性尿崩症の診断，治療を受けていたが，自己中断していた。エコーにて著明な尿路拡張をきたした。症例1は，利尿剤にて1日尿量の減少を認めたが，残尿は続いていた。一方，症例2は，利尿剤にて1日尿量の著明な減少と水腎症の改善，さらに残尿の消失を認めた。

We report two cases of diabetes insipidus with dilatation of urinary tract. The first case was a 5-year-old man, who presented to our hospital because of enuresis. A second case was a 23-year-old man, who consulted our hospital because of thirsty, polydipsia and polyuria. In both patients, abdominal echograms showed bilateral hydrour-eteronephrosis and enlarged urinary bladder. Dilatation of urinary tract was considered to be resulted from polyuria. The water deprivation test revealed low urine osmolarity. A diagnosis of nephrogenic diabetes insipidus was made.