Diagnosis of breast lesions by views enhanced MRI.

Objective To investigate the value of VIEWS dynamic enhanced MRI in the diagnosis of breast lesions.Methods78 patients with breast lesions,surgically and pathologically proved,were enrolled in our series.All lesions were evaluated with pain and VIEWS dynamic enhanced MRI.MRI VIEWS was performed on a continuous 5 minutes and 5 sequences of scan and subtraction of breast lesions.The morphological manifestations of enhancing patterns and the types of time-signal intensity curve of the lesions were analyzed.ResultsThere were 60 malignant and 41 benign lesions in our collection of 78 patients.A great number of the benign lesions show rotund and smooth margins,while the malignant lesions revealed irregular,speculated and lobular ones or crab foot signs.The enhancement patterns of malignant and benign lesions were different.Significant difference in the types of time-signal intensity curve between benign and malignant lesions(χ2= 55.2,P0.001) were shown.The most of benign lesions showed gradually enhanced.All malignant lesions in our series showed early(1～2 minutes) significantly enhanced.Benign lesions often showed I persistent-type (13/15),malignant lesions showed Ⅲ clearance-type(52/60).Conclusion VIEWS dynamic enhanced MRI of breast offered conspicuous signs and more information in morphological features of the lesions and the characteristics of time-signal intensity curves which reflected the hemodynamics of benign and malignant lesions.The features of the lesions was thought to be a useful signs to differentiate between benign and malignant lesions.The first 1 minute enhanced scan was benefit to show the early blood supply of lesions.The fifth minute enhanced scan was favorable characteristics of edge and infiltration within the structure of lesions.Significantly enhanced in the first 1 minute,irregular,speculated and lobular ones or crab foot signs,the Ⅲ-type time-signal curve were the characteristics of breast cancer.The subtraction diagram of five stages shows more clearly,more intuitive of the lesions.