mesosternellum

例句：

1. 1.The patient was diagnosed with a rare form of cancer that had metastasized to his lungs.
   这名患者被诊断出患有一种罕见的癌症，这种癌症已经转移到了他的肺部。
2. 2. The doctor advised the patient to undergo surgery to remove the tumor from his chest.
   医生建议患者接受手术，以从他的胸腔中取出肿瘤。
3. 3.The patient's condition worsened after receiving treatment and required further medical intervention.
   患者在接受了治疗后病情恶化，需要进一步的医疗干预。