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在丹麦从1949年起就对钍造影剂病例进行观察。这些病例(除个别外)是在1935～1946年间主要由于罹患神经系统疾病需作动脉造影而接受钍造影剂(Thorotrast)注射的。据1973年的资料,丹麦钍造影剂病例共计1012人(男性671人,女性441人),其中621人已死去。钍造影剂病例的恶性肿瘤可分为两组,钍造影剂诱发者与其它恶性肿瘤属于前者的是肝肿瘤和白血病。
In Denmark since 1949, observations of sputum contrast agents have been performed. These cases (except in some cases) received thorotrast injections during the period 1935–1946, mainly due to the need for an arteriography of a neurological condition. According to data from 1973, there were 1012 cases of contrast agents in Denmark (671 males and 441 females), of which 621 were dead. Malignant neoplasms in contrast media can be divided into two groups. Contrast-inducing agents and other malignant tumors belong to the former and they are liver tumors and leukemia.