spontaneous tumor

例句：

1. 1.The spontaneous tumor grew rapidly, causing significant pain and discomfort.
   这个自发肿瘤迅速生长，导致剧烈的疼痛和不适。
2. 2.The doctor diagnosed the patient with a spontaneous tumor in his liver.
   医生诊断患者肝脏中有一个自发肿瘤。
3. 3.The spontaneous tumor was removed surgically to relieve the patient's symptoms.
   外科手术移除了患者的自发肿瘤以缓解症状。