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目的：评价肺部高分辨率ＣＴ（ＨＲＣＴ）对孤立性肺结节定性诊断能力。方法：对７５例结节（＜４ｃｍ）的ＨＲＣＴ表现进行分析。根据结节边缘、内部结构、大小、特殊征象及ＣＴ值测定将其分为三组，即典型恶性结节（１９）、典型良性结节（１８）及非典型结节（３８）。结果：对３３例恶性及４２例良性结节的正确诊断率分别为７２．７％和５９．５％。结节有分叶或切迹、其内密度不均匀、周围有短小毛棘或小棘状突起、伴胸膜凹陷征及供养血管等多见于小肺癌。结论：ＨＲＣＴ在征象显示率方面明显优于常规ＣＴ。误诊的主要原因是一些征象在良恶性结节中均可以出现
Objective: To evaluate the ability of pulmonary high resolution CT (HRCT) in the diagnosis of solitary pulmonary nodules. Methods: The HRCT findings of 75 nodules (<4 cm) were analyzed. According to the nodule edge, internal structure, size, special signs and CT values were divided into three groups, namely typical malignant nodules (19), typical benign nodules (18) and atypical nodules (38). Results: The correct diagnosis rates of 33 malignant and 42 benign nodules were 72.7% and 59.5% respectively. Nodules are lobulated or notch, the density is uneven, around a short spinous process or small spines, with pleural indentation and vascular support more common in small lung cancer. Conclusion: HRCT is better than conventional CT in displaying signs. The main reason for misdiagnosis is that some signs can appear in benign and malignant nodules