自然縮小傾向を示した先天性多嚢腎

SPONTANEOUS PEGRESSION OF MULTICYSTIC DYSPLASTIC KIDNEYS : EXPERIENCE OF ANTENATALLY DETECTED THREE CASES

　出生前診断にて発見された多嚢腎2例と多発嚢胞を有する異形成腎疑いの1例を報告．羊水過少症なく出生後も無症状で経過観察としたところ，前二者では腎全体もしくは最大の嚢胞が自然縮小，後者では腎が同定不能となった．腎の縮小，消失の事実から多嚢腎，異形成腎，「腎無発生」は一連のものとする意見もある．多嚢腎は高血圧や悪性化の危険は稀で，圧迫症状なく画像上も矛盾なければ腎摘出術は不必要で，定期的経過観察が勧められる．

Herein reported changing appearance of antenatally detected multicystic dysplastic kidneys (MCDK). None of 3 cases skowed oligohydramnio in utero. Case 1 and 2 were thought typical MCDK. However, the other one (case 3) was supposed initially to be multicystic intrapelvic kidney or giant hydroureteronephrosis with ectopic ureter. They were followed after birth because they had no symptoms except abdominal mass. In case 1, the kidney shrank and only the largest cyst was detectable after a year. In case 2, the largest cyst became smaller after a year, although the kidney itself enlarged slightly.