放射治疗偶而能引起放射野正常组织的恶变。本文报道12例,其中7例在放疗前诊断为良性疾病——血管瘤3例,疤痕疙瘩、鼻息肉、外阴白斑症、与骨纤维异常增殖各1例;另5例为鼻咽癌2例,宫颈癌、上颌窦癌和食管癌各1例。良性疾病的总放疗剂 Radiation therapy can occasionally cause malignant transformation of normal tissues in the radiation field. This article reported 12 cases, of which 7 cases were diagnosed as benign disease before radiotherapy - 3 cases of hemangiomas, keloids, nasal polyps, leukoplakia, and abnormal proliferation of bone fibers in 1 case; the other 5 cases of nasopharyngeal carcinoma in 2 cases. There were 1 case of cervical cancer, maxillary sinus cancer and esophageal cancer. The total radiotherapy agent for benign diseases