congenital malformations的用法和样例：
例句
- Intrauterine infections with varicella-zoster virus following maternal varicella in early pregnancy and resulting in congenital malformations are rare.
摘要怀孕初期母亲感染水痘带状疱疹病毒造成的胎内感染可导致罕见的先天畸形。 - It is suggested that lumbosacral agenesis, a severe congenital defect, might be one of the anomalies of diabetic embryopathy.
此病例显示腰荐椎发育不全可能是母亲糖尿病所导致胚胎病变的一种，且无论有无接受胰岛素治疗，此先天畸形仍可能形成。
