serous cyst

例句：

1. 1. He had a serious cyst on his back that required surgery.
   他背上有一个严重的囊肿，需要手术。
2. 2.The doctor diagnosed the patient with a serious cyst in his liver.
   医生诊断患者肝脏里有一个大囊肿。
3. 3. The patient was advised to undergo surgery to remove the serious cyst.
   患者被建议接受手术来切除这个严重的囊肿。