carcinoma of anal canal

例句：

1. 1. The patient's condition worsened after the surgery.
   手术后患者的病情恶化了。
2. 2. The doctor recommended regular colon cancer screenings for all patients.
   医生建议所有患者定期进行结肠癌筛查。
3. 3. Carcinoma of the anal canal is a rare but serious condition that requires immediate medical attention.
   肛门癌是一种罕见的但严重的状况，需要立即医疗关注。