dermoid cyst of mediastinum

例句：

1. 1.The patient was diagnosed with a dermoid cyst of the mediastinum and underwent surgery to remove it.
   这名患者被诊断出患有胸腺囊肿，并接受了手术以移除它。
2. 2.The dermoid cyst caused significant discomfort and required medical attention.
   这个胸腺囊肿引起了严重的不适，需要医疗关注。
3. 3.The dermoid cyst had been present for many years and was causing ongoing problems.
   这个胸腺囊肿已经存在多年，并且一直在造成持续的问题。