结论：囊性肾癌的CT表现有一定特征性。
Conclusion: Cystic carcinoma of kidney has certain ct characteristics.
指某段历史或是某人生活中具有一定特征的阶段。
结论：放射性视网膜病变临床表现有一定特征，结合病史可明确诊断。
Conclusion: Clinical features and history of contact with radiation are helpful to diagnose the radiation retinopathy.
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