Features of Magnetic Resonance Imaging in Breast Ductal Carcinoma in Situ

Purpose To analyze MRI features of the breast ductal carcinoma in situ (DCIS). Materials and Methods 38 cases of DCIS were enrolled and received conventional MRI examination. The imaging findings were analyzed and the diagnostic value was evaluated. Results The lesion was divided into nonmass lesions (26 cases) with a mean apparent diffusion coefficient (ADC) of 1.34×10 -3 mm 2 /s, and mass lesions (12 cases) with a mean ADC of 1.27×10 -3 mm 2 /s. The lesions were limited in one quadrant with a segment distribution in 29 cases, diffusion and regional distribution in 9 cases. The enhancement pattern included heterogeneous patchy enhancement in 12, duct-like enhancement in 8, latticed enhancement in 4, flocculent enhancement and multiple dotted enhancement in 2, homogeneous nodular enhancement in 10, ring-like enhancement in 2, irregular lobular enhancement in 8, and smooth margin enhancement in 4. The enhancement curve included continuous ascending type in 6 mass lesions, flat type in 17, and clearance type in 15. For MRI BI-RADS category, 5 cases were category 3, 33 cases were category 4 and 5. Conclusion The DICS should be considered when the lesions have MRI features of nonmass type, segment distribution, and with heterogeneous patchy, duct-like or latticed enhancement.