3 sentences

1. 医生诊断他患有肛瘘。

   yī​shēng zhěn​duàn tā huàn​yǒu gāng lòu.

   The doctor diagnosed him with an anal fistula.

   Source: Dong Chinese Dictionary

2. 肛门是消化系统的出口。

   gāng mén shì xiāo​huà xì​tǒng de chū​kǒu.

   The anus is the exit of the digestive system.

   Source: Dong Chinese Dictionary

3. 长期便秘可能会引起脱肛。

   cháng​qī biàn​mì kě​néng huì yǐn​qǐ tuō gāng.

   Chronic constipation can lead to rectal prolapse.

   Source: Dong Chinese Dictionary