乳腺癌动态增强MRI与X线摄影的对比分析

目的:通过对乳腺癌动态增强MRI表现与X线摄影的对比分析,评价两者对乳腺癌的诊断价值。材料和方法:回顾性分析了50例乳腺癌的动态增强MRI与X线摄影,MRI分别采用自旋回波(FSE)序列加预饱和脂肪抑制技术(SPIR)、减影技术及快速三维动态增强扫描。X线摄影采用常规方法摄片。结果:乳腺MRI在显示肿块形态、边缘、内部结构、与周围组织关系、乳内淋巴结方面优于X线摄影;X线摄影在显示钙化方面占绝对优势,检出乳腺癌的敏感性分别为:MRI93%(47/50),X线摄影82%(41/50),两者比较差异有显著性(P<0.01);两种方法结合检查的敏感性为98%(49/50)。结论:NRI、X线摄影各有优势和限度,检查乳腺癌敏感性MRI较X线摄影高,而当两种方法联合应用时,可减少乳腺癌的漏诊率,从而提高病变诊断的准确性。     

全数字化乳腺摄影与MRI对乳腺恶性病变诊断的对比分析

目的 探讨乳腺癌全数字化乳腺摄影(full-field digital mammography,FFDM)与乳腺MRI的影像学表现,评价其对乳腺癌的诊断价值.方法 收集68例经穿刺或手术病理证实的乳腺癌病例,对比分析其X线摄影及MRI表现.全数字化乳腺摄影采用常规方法摄片,MRI采用自旋回波T1WI,T2WI序列及动态增强扫描等.结果 68例乳腺恶性肿瘤中,浸润性导管癌57例,浸润性小叶癌3例,叶状囊肉瘤1例,血管肉瘤1例,导管内癌2例,炎性乳癌2例,印戒细胞癌1例,Paget's病1例.乳腺X线摄影诊断正确61例,诊断准确率89.7％.MRI诊断正确66例,诊断准确率97.1％.结论 乳腺X线摄影是乳腺恶性病变的首选检查方法,MRI能更多的显示乳腺病灶的内部特征,二者联合应用对乳腺癌的临床诊断具有重要意义.     

MRI检查对乳腺X线摄影中非对称性致密和/或结构扭曲的诊断价值

目的探讨MRI动态增强检查对全数字化乳腺X线摄影发现的乳腺非对称性致密和/或结构扭曲的诊断价值。方法回顾性分析我院2012年1月~2016年10月间乳腺疾病手术患者91例,均行双侧乳腺X线摄影检查,诊断为乳腺非对称性致密和/或结构扭曲,结合BI-RADS分型标准将病变归为BI-RADS 4类,并在两周内行MRI平扫及动态增强检查,由两名医师分析乳腺病变的图像特征性表现,做出相应的影像学诊断。结果 X线摄影显示48例非对称性致密影,7例结构扭曲,36例非对称性致密和/或结构扭曲;MRI诊断示33例乳腺癌,21例纤维腺瘤,7例乳腺炎症,18例乳腺腺病,6例囊肿,6例导管内乳头状瘤。以病理诊断为金标准,MRI诊断的准确性为90.1%(82/91),诊断乳腺癌的敏感性为94.3%(33/35)。结论乳腺X线摄影表现为腺体非对称性致密和/或结构扭曲者,MRI动态增强检查能明显提高乳腺病变的定性诊断率。     

乳腺钼靶与MRI检查对炎性乳腺癌的诊断价值

目的:探讨钼靶X线摄影、MRI检查对炎性乳腺癌的诊断价值。方法:回顾性分析16例经手术病理证实的炎性乳腺癌的钼靶X线摄影及MRI检查资料,分析其影像学特征。结果:16例中钼靶X线摄影表现为局限性肿块4例,广泛浸润12例,皮肤增厚16例,腋下淋巴结肿大3例。MRI表现:T1WI平扫示皮肤增厚,T2WI示受累乳腺信号强度呈弥漫性升高,增强扫描后明显强化。结论:炎性乳腺癌的钼靶X线摄影、MRI表现具有一定的特征性,有助于提高炎性乳腺癌的诊断正确率。     

乳腺疾病的动态增强MRI研究

目的　评价动态增强MRI对乳腺良、恶性病变的诊断价值。方法　对 63例临床疑为乳腺疾病的患者进行前瞻性常规MRI平扫和动态增强MRI扫描。分析比较良、恶性病变的形态学及强化特征 ,根据MRI表现鉴别良、恶性疾病 ,并与X线及病理结果比较。结果　 63例患者共计 78个病灶 ,恶性 33个 ,良性 45个。动态增强MRI根据病变的形态学和强化特征诊断乳腺良、恶性病变的准确率为 92 %。结论　动态增强MRI能清晰显示乳腺病变并作出定性诊断 ,因而是评价乳腺疾病的一种有效的影像学方法。     

MRI、CT与乳腺X线摄影诊断乳腺疾病临床价值分析

目的探讨MRI、CT及诊断X线摄影等三种检查方法在乳腺疾病诊断中的应用价值。方法对收治的乳腺疾病患者分别采用MRI、CT及乳腺X线摄影进行检查,比较三种检查方法在乳腺疾病诊断中的应用价值。结果乳腺X线摄影、CT和MRI检查出的病灶直径与病理检查结果比较无明显差异。本文98例患者经病理检查发现112枚病灶,其中确诊良性68枚,恶性44枚。乳腺X线摄影诊断良、恶性乳腺病变的敏感性、特异性及准确性分别为68.18%、69.12%、68.75%;MRI诊断良、恶性乳腺病变的敏感性、特异性及准确性分别为88.64%、91.18%、90.18%;CT诊断良、恶性乳腺病变的敏感性、特异性及准确性分别为80.00%、88.06%、84.82%;经统计学分析发现MRI诊断良、恶性乳腺病变的敏感性、特异性及准确性均明显高于乳腺钼靶X线和CT,且差异具有统计学意义。结论乳腺X线摄影有利于早期发现乳腺疾病,MRI、CT增强可提高乳腺疾病诊断特异性和检出率,三者相结合缺点互补大大提高乳腺癌的诊断准确率。     

乳腺疾病的MRI诊断

目的：探讨乳腺疾病的MRI平扫与增强扫描的影像特点。方法：收集乳腺疾病33例，其中乳腺癌12例，良性病变18例，隆乳术后患者3例，均行MRI扫描，22例同时进行钼靶摄影。结果：①乳腺癌MRI表现为：形态不规则结节或肿块，边缘分叶或毛刺，增强扫描多呈不均匀强化，毛刺样结构显示更清晰。②良性病变：纤维腺瘤病灶呈圆形或类圆形，边缘光滑，无毛刺样结构，增强后均匀强化；乳腺增生表现为乳腺腺体增厚，形态规则。③MRI与钼靶结果比较，MRI在发现病灶，了解病变范围以及显示淋巴结转移方面优于钼靶。结论：MRI是评价乳腺疾病的一种有效的影像学方法。     

动态增强MRI与乳腺X线摄影检查乳腺病变的临床应用对比

目的探讨动态增强MRI与乳腺X线摄影在诊断乳腺病变中的应用价值。方法乳腺病变患者应用动态增强MRI与乳腺X线摄影进行检查,两种检查方法在发现病变及良恶性肿块鉴别方面的诊断能力进行对比研究。结果以病理确诊结果为金标准,计算乳腺X线摄影诊断良、恶性乳腺病变的敏感性为65.63%,特异性为70.64%,准确性为68.79%;DCE-MRI诊断良、恶性乳腺病变的敏感性为87.50%,特异性为90.83%,准确性为89.60%;经统计学分析发现DCE-MRI诊断良、恶性乳腺病变的敏感性、特异性及准确性均明显高于乳腺X线摄影,且差异具有统计学意义。结论动态增强MRI对乳腺病变的鉴别诊断效能要优于乳腺X线摄影,两种技术联合使用可以发挥优势互补的作用。     

乳腺X线摄影和增强磁共振在乳腺病变诊断中的应用对比

目的探讨乳腺X线摄影和增强磁共振(DCE-MRI)在乳腺病变诊断中的应用效果。方法对收治乳腺疾病患者采用乳腺X线摄影X线和增强磁共振进行检查,对比两种检查应用效果。结果本组患者经病理检查发现乳腺X线摄影诊断乳腺良、恶性病变的敏感性、特异性及准确性和DCE-MRI诊断乳腺良、恶性病变的敏感性、特异性及准确性(P0.05);经分析发现DCE-MRI诊断良、恶性乳腺病变的敏感性、特异性及准确性均明显高于乳腺X线摄影,且差异具有统计学意义。结论增强磁共振对乳腺病变的诊断价值明显优于乳腺X线摄影,能有效为乳腺癌保乳术病例提供指导。     

乳腺疾病的X线钼靶与MRI对比研究

目的 分析乳腺疾病的X线钼靶与MRI影像学表现,评价X线钼靶与MRI对乳腺疾病的诊断价值。方法 回顾性分析了60例乳腺疾病的X线钼靶与MRI表现,MRI分别采用自旋回波T1WI、短时反转恢复(STIR)序列及动态增强扫描。X线钼靶采用常规方法摄片。结果MRI 53例诊断正确,与病理结果相符,MRI诊断的准确率为88.3％,X线钼靶38例诊断正确,与病理结果相符,X线钼靶诊断的准确率为63.3％,两者差异具有显著性意义,X2=10.23,P<0.01。结论 MRI对乳腺疾病的诊断价值明显优于X线钼靶,对乳腺疾病的临床诊断及治疗具有重要意义。     

Breast MRI for evaluating patients with metastatic axillary lymph node and initially negative mammography and sonography.

OBJECTIVE: We wanted to investigate the ability of breast MR imaging to identify the primary malignancy in patients with axillary lymph node metastases and initially negative mammography and sonography, and we correlated those results with the conventional imaging. MATERIALS AND METHODS: From September 2001 to April 2006, 12 patients with axillary lymph node metastases and initially negative mammography and sonography underwent breast MR imaging to identify occult breast carcinoma. We analyzed the findings of the MR imaging, the MR-correlated mammography and the second-look sonography. We followed up both the MR-positive and MR-negative patients. RESULTS: MR imaging detected occult breast carcinoma in 10 of 12 (83%) patients. Two MR-negative patients were free of carcinoma in the ipsilateral breast during their follow-up period (39 and 44 months, respectively). In nine out of 10 patients, the MR-correlated mammography and second-look sonography localized lesions that were not detected on the initial exam. All the non-MR-correlated sonographic abnormalities were benign. CONCLUSION: Breast MR imaging can identify otherwise occult breast cancer in patients with metastatic axillary lymph nodes. Localization of the lesions through MR-correlated mammography and second-look sonography is practically feasible in most cases.     

Contrast-enhanced MR mammography for evaluation of the contralateral breast in patients with diagnosed unilateral breast cancer or high-risk lesions

PURPOSE: To prospectively evaluate accuracy of gadobenate dimeglumine-enhanced magnetic resonance (MR) mammography for depiction of synchronous contralateral breast cancer in patients with newly diagnosed unilateral breast cancer or high-risk lesions, with histologic analysis or follow-up as reference. MATERIALS AND METHODS: The study had ethics committee approval; all patients provided written informed consent. One hundred eighteen consecutive women (mean age, 52 years) with unilateral breast cancer or high-risk lesions and negative findings in the contralateral breast at physical examination, ultrasonography, and conventional mammography underwent gadobenate dimeglumine-enhanced 1.5-T MR mammography. Transverse three-dimensional T1-weighted gradient-echo images were acquired before and at 0, 2, 4, 6, and 8 minutes after gadobenate dimeglumine administration (0.1 mmol per kilogram body weight). Breast Imaging Reporting and Data System (BI-RADS) was used to categorize breast density and the level of suspicion for malignant contralateral breast lesions. Results were compared with histologic findings. Sensitivity, specificity, accuracy, and positive and negative predictive values for contrast-enhanced MR mammography were evaluated. RESULTS: Contrast-enhanced MR mammography revealed contralateral lesions in 28 (24%) of 118 patients. Twenty-four lesions were detected in patients with dense breasts (BI-RADS breast density category III or IV). Lesions in eight (29%) of 28 patients were BI-RADS category 4; patients underwent biopsy. Lesions in 20 (71%) patients were BI-RADS category 5; patients underwent surgery. At histologic analysis, 22 lesions were confirmed as malignant; six lesions were fibroadenomas. No false-negative lesions were detected; none of the fibroadenomas were BI-RADS category 5. The sensitivity, specificity, accuracy, and positive and negative predictive values of contrast-enhanced MR mammography for depiction of malignant or high-risk contralateral lesions were 100%, 94%, 95%, 79%, and 100%, respectively. Follow-up findings (12-24 months) confirmed absence of contralateral lesions in 90 of 118 patients with negative contrast-enhanced MR mammographic findings in the contralateral breast. CONCLUSION: Contrast-enhanced MR mammography is accurate for detection of synchronous contralateral cancer or high-risk lesions in patients with newly diagnosed breast cancer or high-risk lesions.     

Breast carcinoma: effect of preoperative contrast-enhanced MR imaging on the therapeutic approach

PURPOSE: To determine if magnetic resonance (MR) imaging can help determine the therapeutic approach in women with breast cancer. MATERIALS AND METHODS: Preoperative contrast-enhanced MR imaging of the breast was performed in 463 patients with probably benign lesions (n = 63), suspicious lesions (n = 230), or lesions highly suggestive of malignancy (n = 170) per established clinical, mammographic, and/or ultrasonographic (US) criteria. T1-weighted fast low-angle shot MR imaging was performed before and after administration of gadopenetetate dimeglumine. MR imaging findings were correlated with other imaging results and histopathologic findings. Special attention was paid to multifocality and multicentricity. RESULTS: Histopathologic analysis revealed 143 benign and 405 malignant lesions. The sensitivity, specificity, and accuracy were 58%, 76%, and 62% for clinical examination; 86%, 32%, and 72% for conventional mammography; 75%, 80%, and 76% for US; and 93%, 65%, and 85% for contrast-enhanced MR imaging. Multifocality in 30 of 42 patients, multicentricity in 24 of 50 patients, and additional contralateral carcinomas in 15 of 19 patients were depicted with MR imaging alone. Due to the MR imaging findings, therapy was changed correctly in 66 patients (14.3%); unnecessary open biopsy was performed in 16 patients (3.5%). CONCLUSION: Contrast-enhanced MR imaging of the breast is highly sensitive for invasive breast cancer. MR imaging may reveal unsuspected multifocal, multicentric, or contralateral breast carcinoma and result in therapy changes.     

Breast MR imaging: applications and pitfalls

CONTEXT: Contrast-enhanced magnetic resonance (MR) imaging provides better detail of the breast than either mammography or ultrasound imaging and can be a valuable adjunct to other imaging techniques, particularly for small lesions, in dense or augmented breasts and for treatment planning. OBJECTIVE: To illustrate some common technical problems encountered with MR imaging of the breast and present breast pathologies depicted with MR. RESULTS: Using a case-study approach, the authors discuss breast MR imaging difficulties related to hardware, software, technologist performance and patient cooperation. They also present examples of contralateral breast cancer, recurrent breast carcinoma and local staging of breast cancer with MR imaging. Summary MR imaging of the breast has important advantages over other techniques, despite occasional technical problems.     

MR imaging findings in the contralateral breast of women with recently diagnosed breast cancer

OBJECTIVE: The purpose of this study was to determine the frequency and positive predictive value of biopsy performed on the basis of MR imaging findings in the contralateral breast in women with recently diagnosed breast cancer. MATERIALS AND METHODS: We performed a retrospective review of records of 1336 consecutive breast MR imaging examinations over a 2-year period. Of these examinations, 223 imaged the asymptomatic, mammographically normal contralateral breast in women whose breast cancer was diagnosed within 6 months preceding MR imaging. Records of these 223 examinations were reviewed to determine the frequency of recommending contralateral breast biopsy and the biopsy results. RESULTS: Contralateral breast biopsy was recommended in 72 (32%) of 223 women and performed in 61 women. Cancer occult to mammography and physical examination was detected by MR imaging in 12 women, constituting 20% (12/61) of women who underwent contralateral biopsy and 5% (12/223) of women who underwent contralateral breast MR imaging. Among these 12 cancers, six (50%) were ductal carcinoma in situ (DCIS) and six (50%) were infiltrating carcinoma. The median size of infiltrating carcinoma was 0.5 cm (range, 0.1-1.0 cm). Contralateral biopsy revealed benign (n = 31) or high-risk (n = 18) lesions in 49 women, constituting 80% (49/61) of women who underwent contralateral biopsy and 22% (49/223) of women who underwent contralateral MR imaging. CONCLUSION: In women with recently diagnosed breast cancer, MR imaging of the contralateral breast led to a biopsy recommendation in 32%. Cancer was found in 20% of women who underwent contralateral breast biopsy and in 5% of women who underwent contralateral breast MR imaging.     

Human breast lesions: characterization with contrast-enhanced in vivo proton MR spectroscopy--initial results.

PURPOSE: To assess the clinical usefulness of localized proton (hydrogen 1) magnetic resonance (MR) spectroscopy in the characterization of contrast material-enhanced breast lesions on the basis of choline detection. MATERIALS AND METHODS: Examinations were performed at 1.5 T with use of a standard breast coil. Contrast-enhanced MR imaging was performed in 30 consecutive patients (mean age, 50 years; age range, 20--80 years) who had nonspecific lesions (>1.5 cm in diameter) on sonograms or mammograms. Single-voxel (1)H MR spectroscopy was performed in the enhancing lesions by using a point-resolved spectroscopic sequence with echo times of 38, 135, and 270 msec. MR spectroscopic and histopathologic findings were determined in blinded fashion and compared. RESULTS: Twenty-four patients had carcinoma of the breast (tumor size, 2.0--11.2 cm; mean, 4.7 cm), and six had benign lesions (lesion size, 1.8--3.8 cm; mean, 2.7 cm). Choline was detected in 22 patients with carcinoma. Choline was not detected in five patients with benign lesions and in two patients with carcinoma. The preliminary results indicate that this technique had a sensitivity of 92%, specificity of 83%, and accuracy of 90%. CONCLUSION: Choline can be reliably detected in less than 45 minutes in large contrast-enhanced breast lesions by using a multiecho point-resolved spectroscopic protocol. The presence of water-soluble choline metabolites obtainable with (1)H MR spectroscopy could complement MR imaging findings to improve specificity and to reduce the number of unnecessary biopsies.     

Preoperative assessment of breast cancer: sonography versus MR imaging

OBJECTIVE: The purposes of our study were to compare the diagnostic value of whole-breast sonography and MR imaging as adjunctive techniques to mammography and to determine whether MR imaging should be used routinely in the preoperative assessment of patients with suspected breast cancer. SUBJECTS AND METHODS:. One hundred four women (age range, 34-84 years; mean age, 60 years) with findings highly suggestive of malignancy in the breast were examined with mammography, sonography, and dynamic MR imaging before undergoing surgery. All visualized suspicious lesions were correlated histologically. The diagnostic relevance of sonographic and MR imaging findings was compared with the diagnostic value of the findings of clinical examination and mammography alone. RESULTS:. Twenty-seven tumors showed multifocal or multicentric invasive growth at pathology. Of these 27, 48% were correctly diagnosed via mammography alone; 63%, via the combination of mammography and sonography; and 81%, via MR imaging. Nine of the index tumors were invisible on mammography but were detected on sonography. Use of sonography benefited 13 patients and produced two studies with false-positive findings. Use of MR imaging benefited seven patients and produced eight studies with false-positive findings. In summary, 93% of all patients gained no advantage from MR imaging. Relevant additional findings were significantly more frequent in patients with dense breasts. CONCLUSION: Although MR imaging is most sensitive for the detection of small tumors, routine preoperative MR imaging appears to be unnecessary for most patients if a combination of mammography and whole-breast sonography is used. Additional MR imaging can be restricted to problematic cases in women with dense breast parenchyma.     

Preoperative MR imaging-guided needle localization of breast lesions

OBJECTIVE: MR imaging of the breast can depict cancer that is occult on mammography and at physical examination. Our study was undertaken to determine the ease of performance and the outcome of MR imaging-guided needle localization and surgical excision of breast lesions. MATERIALS AND METHODS: Retrospective review revealed 101 consecutive breast lesions that had preoperative MR imaging-guided needle localization with commercially available equipment, including a 1.5-T magnet with a breast surface coil, a dedicated biopsy compression device, and MR imaging-compatible hookwires. Imaging studies and medical records were reviewed. RESULTS: Histologic findings in these 101 lesions were carcinoma in 31 (30.7%), high-risk lesions (atypical ductal hyperplasia or lobular carcinoma in situ) in nine (8.9%), and benign lesions in 61 (60.4%). Fifteen (48.4%) of 31 carcinomas were ductal carcinoma in situ, and 16 (51.6%) were infiltrating carcinoma (size range, 0.1-2.0 cm; median, 1.2 cm). Carcinoma was found in 16 (45.7%) of 35 lesions detected in women with synchronous cancer, 10 (32.3%) of 31 lesions detected on MR imaging for problem solving, and five (14.3%) of 35 lesions detected on MR screening. The time range to perform MR imaging-guided localization was 15-59 min (median time, 31 min). Complications encountered in three cases were retained wire fragments in two and breakage of the wire tip in one. CONCLUSION: MR imaging-guided needle localization can be performed quickly and safely with commercially available equipment. The positive predictive value of MR imaging-guided needle localization (30.7%) was comparable to that reported for mammographically guided needle localization and was highest in women with synchronous breast cancer.     

MR imaging in probably benign lesions (BI-RADS category 3) of the breast

PURPOSE: To investigate the role of dynamic magnetic resonance (MR) imaging in the evaluation of probably benign lesions (BI-RADS category 3) and its contribution to patient management. MATERIALS AND METHODS: Dynamic breast MR imaging was performed in 56 lesions assessed as probably benign in mammography of 43 patients. In MR imaging, T2-weighted turbo spin echo (TSE) with fat suppression sequence followed by pre- and post-contrast T1-weighted 3D-FLASH sequences were used. MR imaging findings were scored using 0-2 point criterion scale. The lesions were divided into five groups according to their total score (0 point: group 1, negative; 1-2 points: group 2, benign; 3 points: group 3, probably benign; 4-5 points: group 4, suspicious for malignancy; 6-8 points: group 5, highly suggestive of malignancy). Histopathologic verification of lesions in group 4 and above was obtained. Lesions in group 3 were either biopsied or followed up by mammography or MR imaging. Lesions in group 1-2 were followed by mammography of 6-month intervals for 2 years. The sensitivity, specificity, accuracy, and positive and negative predictive values of MR imaging in the determination of malignancy in BI-RADS category 3 lesions were calculated. RESULTS: Fifty-six findings (45 mass, 9 breast tissue, 2 focal enhancement) in 43 patients were detected in MR imaging. According to their total score, 41 lesions (73.2%) and breast tissue had 0 point (group 1); 10 lesions (17.8%) had 1-2 points (group 2); 2 lesions (3.6%) had 3 points (group 3); 2 lesions (3.6%) had 4 and 5 points (group 4); and 1 lesion (1.8%) had 6 points (group 5). Ten lesions (of six in groups 1 and 2, one in group 3, three in groups 4 and 5) were histopathologically confirmed. Out of 10 lesions, only 1 (1.8%) with 4 points in group 4 was diagnosed as invasive ductal carcinoma. Other lesions followed with mammography or MR imaging did not change. The sensitivity, specificity, accuracy, positive and negative predictive values of MR imaging in the determination of malignancy in BI-RADS category 3 lesions were calculated as 100, 96.4, 96.4, 33.3, and 100%, respectively. CONCLUSION: In the evaluation of BI-RADS category 3 lesions, dynamic MR imaging does not provide additional information with low positive predictive value similar to that of short interval mammography follow-up.     

MR imaging features of infiltrating lobular carcinoma of the breast: histopathologic correlation

OBJECTIVE: Our study aimed to correlate the dynamic contrast-enhanced MR appearance of infiltrating lobular carcinoma of the breast with histopathologic findings. MATERIALS AND METHODS: We retrospectively reviewed the high-resolution, fat-suppressed and dynamic contrast-enhanced MR images of 13 of 20 women diagnosed with pathologically proven infiltrating lobular carcinoma of the breast. Twelve of the 13 women presented with breast symptoms and underwent mammography. Five of the women also had breast sonography. MR imaging was performed for evaluation of disease extent before the patients underwent modified radical mastectomy (n = 11) or lumpectomy (n = 2). Three experienced radiologists reviewed the MR scans. The tumor pattern types described on imaging were correlated with a detailed analysis of the pathology. RESULTS: We found three patterns of infiltrating lobular carcinoma on MR imaging. The tumor pattern on imaging correlated with pathologic tumor morphology. We found the following patterns of infiltrating lobular carcinoma: a solitary mass with irregular margins (n = 4) that corresponded to the same appearance at pathology; multiple lesions, either connected by enhancing strands (n = 6) or separated by nonenhancing intervening tissue (n = 2), that correlated with the pathologic appearance of noncontiguous tumor foci, with malignant cells streaming in single-file fashion in the breast stroma or small tumor aggregates separated by normal tissue; and enhancing septa only, which were correlated with the histopathologic appearance of tumor cells streaming in the breast stroma (n = 1). CONCLUSION: Infiltrating lobular carcinoma may be detected on MR imaging as solitary or multiple lesions that correspond to tumor morphology on pathologic examination. The appearance of multiple lesions or of enhancing fibroglandular breast elements on MR imaging is suggestive of infiltrating lobular carcinoma.