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目的：分析全数字化乳腺X线摄影技术（ FFDM）对乳腺导管原位癌伴微浸润（ DCIS－MI）诊断的价值。方法回顾性分析经手术病理证实的42例单纯乳腺导管原位癌（ DCIS）和47例乳腺导管原位癌伴微浸润（ DCIS－MI）的FFDM表现，用SPSS 16．0软件分析，数据采用χ2检验。结果42例单纯DCIS中单纯钙化13例，肿块11例，5例为肿块伴钙化；病变最大径平均值17．4 mm；腺体结构紊乱4例；无异常征象9例。47例DCIS－MI中单纯钙化28例，肿块12例，15例为肿块伴钙化；病变最大径平均值22．1 mm；腺体结构紊乱1例；无异常征象6例。两者病灶最大径有统计学意义（P＜0．05）；而钙化数目及形态无统计学意义（P＞0．05）。结论 FFDM对DCIS－MI的诊断具有一定的临床价值，能为术前评估提供帮助。“,”Objective To evaluate the application of full field digital mammography ( FFDM) to diagnose ductal carcinoma in situ with micro-invasion ( DCIS-MI) .Methods Retrospective analysis was performed using the FFDM images from 42 patients with ductal carcinoma in situ ( DCIS) alone and 47 DCIS-MI patients.All data were analyzed by SPSS16.0 software.Results Among the DCIS patients, 13 patients presented simple calcification, 11 showed mass, 5 manifested mass with calcification, with an average maximum diameter of 17.4 mm in the lesion, and 4 presented glan-dular disorder in structure, in addition to 9 patients without abnormal signs.Among the DCIS-MI patients, 28 patients presented simple calcification, 12 showed mass, 15 manifested mass with calcification, with an average maximum diame-ter of 22.1 mm in the lesion, and 1 presented glandular disorder in structure, in addition to 6 patients without abnormal signs.Statistical difference was found in the maximum diameter between the two groups (P0.05).Conclusions FFDM is ef-fective for DCIS-MI diagnosis, which can provide evidence for preoperative evaluation.