动态对比增强磁共振成像对术前空芯针穿刺活检诊断为乳腺导管原位癌术后病理升级为乳腺浸润性导管癌的评估价值

Value of DCE-MRI in the evaluation of preoperative core needle biopsy diagnosis of ductal carcinoma in situ and postoperative pathology upgrade to invasive ductal carcinoma

目的通过分析术前空芯针穿刺活检(CNB)诊断为乳腺导管原位癌(DCIS)术后升级为乳腺浸润性导管癌(IDC)病例的MRI特征,探讨乳腺动态对比增强磁共振成像(DCE-MRI)的评估价值。方法回顾性分析2012年1月~2022年12月华南理工大学附属第六医院收治的经超声引导下CNB诊断的乳腺DCIS(含微浸润)患者104例,所有患者均进行乳腺MRI检查,对比分析术后未升级DCIS和术后升级为IDC的大小、形态、边缘及内部强化特征等。结果术前CNB诊断为DCIS 104例,手术后仍为DCIS(含微浸润)64例,病理升级为IDC 40例,升级比例(病理学低估)约为38.5%。未升级DCIS组肿块病变18例,非肿块病变46例,升级为IDC组肿块病变19例,非肿块病变21例,两者间差异有统计学意义(P<0.05)。DCE-MRI特征方面,病灶表现为非肿块样强化时,未升级DCIS主要表现为段样分布,不均质强化;术后升级为IDC主要表现为区域分布,集簇强化。病灶表现为肿块样强化时,未升级DCIS组边缘清晰,术后升级IDC组多为边缘毛刺状。时间-信号强度曲线分型上,术后未升级DCIS主要为平台型,其次为渐增型,而术后升级为IDC则主要为流出型,其次为平台型,两者间差异有统计学意义(P<0.05)。结论乳腺MRI成像对于CNB证实的DCIS是否存在手术后病理学升级具有潜在价值,有利于临床制定针对性治疗方案。

Objective To explore the evaluation value of dynamic contrast-enhanced magnetic resonance imaging(DCE-MRI) in breast cancer by analyzing the MRI features of cases with ductal carcinoma in situ(DCIS) and upgraded to invasive ductal carcinoma(IDC) after surgery diagnosed by preoperative core needle biopsy(CNB).Methods The data of 104 patients with breast DCIS(including microinvasion) diagnosed by CNB admitted to the Sixth Affiliated Hospital of South China University of Technology from January 2012 to December 2022 were retrospectively analyzed.All patients underwent breast DCE-MRI.The DCE-MRI features of postoperative non-upgraded DCIS and postoperative upgraded IDC were compared,including size,morphology,edge,and internal enhancement pattern.Results Among 104 cases with DCIS by CNB before surgery,64remained as DCIS postoperatively(including microinvasion) and 40 were postoperatively upgraded to IDC,with an upgrading ratio(pathological underestimation) of approximately 38.5%.In the non-upgraded DCIS group,there were 18 cases of mass lesions and 46 cases of non-mass lesions;in the upgraded IDC group,there were 19 cases of mass lesions and 21 cases of non-mass lesions with statistically significant differences between the two groups(P<0.05).In terms of DCE-MRI features,when the lesions appeared as non-mass enhancement,the non-upgraded DCIS mainly showed segmental distribution and heterogeneous enhancement,while the upgraded IDC mainly showed regional distribution and clustered enhancement.When the lesions appeared as mass enhancement,the non-upgraded DCIS group had clear margins,while the the upgraded IDC mostly had spiculated margins.Concerning the time-signal strength curve classification,the non-upgraded DCIS mainly showed plateau curves followed by persistent enhancing curves,while the the upgraded IDC mainly exhibited outflow curves followed by plateau curves,with statistically significant differences between the two groups(P<0.05).Conclusion Breast DCEMRI has potential value in determining postoperative pathological upgrade of DCIS confirmed by CNB,which is conducive to the formulation of targeted treatment plans in clinical practice.