Objectives: To investigate the diagnostic value of a Superb Microvascular Imaging (SMI; Toshiba Medical Systems, Tokyo, Japan) Doppler examination for distinguishing intraductal papilloma (IDP) from duct ectasia with secretion in lesions smaller than 1 cm compared to color Doppler imaging (CDI) and power Doppler imaging (PDI).
Methods: Fifty-nine lesions were evaluated by grayscale ultrasound, CDI, PDI, and SMI. Biopsied tissue samples were analyzed. Ultrasound evaluations and Doppler examinations were performed with a Toshiba Aplio 500 device. The lesions were divided into 2 groups, secretion and IDP, according to the pathologic results. Color Doppler imaging, PDI, and SMI data were compared statistically to investigate their diagnostic values.
Results: Of the 59 lesions, 22 were secretion, and 37 were IDP. The mean diameters ± SDs were 4.7 ± 0.6 mm in the secretion group and 4.9 ± 0.8 mm in the IDP group (P = .315). There was no significant difference in grayscale ultrasound features such as shape or margin between the groups (P > .05). No significant difference was found between the groups in CDI or PDI characteristics (P > .999; P = .702, respectively). The color SMI evaluation results showed no vascularity in 18 (81.8%) lesions in the secretion group. Vascularity was detected in 32 patients (86.5%) in the IDP group. In the receiver operating characteristic analysis, the areas under the curve were calculated as 0.842 (95% confidence interval [CI], 0.728-0.925) for SMI, 0.522 (95% CI, 0.388-0.654) for PDI, and 0.518 (95% CI, 0.384-0.650) for CDI.
Conclusions: Superb Microvascular Imaging is more accurate and has more diagnostic ability than CDI or PDI in distinguishing small IDPs from duct ectasia with secretion because of its ability to visualize slow flow speeds of vascular structures.
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