posterior wall的用法和样例：
例句
- We presented a 46 years old woman with posterior wall RVF after the rectal cancer surgery.
我们在此提出一位四十六岁女性，在经过直肠癌手术之后，发现有直肠阴道后壁瘘管。 - Echocardiography demonstrated a mass attached to the posterior left atrial wall protruding into the mitral orifice during diastole.
心脏超音波影像可见肿瘤依附左心房后壁，于舒张期阻塞二尖瓣开口突入左心室。
