retroperitoneal abscess

例句：

1. 1.The patient was diagnosed with a retroperitoneal abscess, and underwent emergency surgery.
   患者被诊断出患有腹膜后脓肿，并接受了紧急手术。
2. 2. The doctor explained the symptoms of a retroperitoneal abscess to the patient.
   医生向患者解释了腹膜后脓肿的症状。
3. 3.The patient recovered after undergoing treatment for a retroperitoneal abscess.
   经过治疗，患者恢复了健康。