The diagnosis of ipsilateral breast tumor recurrence (IBTR) after breast-conserving therapy is of great interest to breast physicians. The present study compared the utility of gray-scale sonography standardized by a breast imaging reporting and data system (BI-RADS) and power Doppler sonography for differentiating between benign scar formation and IBTR after breast-conserving therapy. Gray-scale sonography detected 83 solid breast lesions classified as BI-RADS categories 3-5 in 272 patients after breast-conserving therapy, and these lesions were entered into the study (53 lesions as category 3, probably benign; 30 lesions as categories 4-5, suspected malignancy). Power Doppler sonography revealed intratumoral flow in 19 of 83 solid breast lesions. BI-RADS category 3 was accepted as probably benign and BI-RADS categories 4-5 were considered as suspicious for breast tumor recurrence in the gray-scale ultrasound criteria. Positive and negative intratumoral flow were employed as suspicious for breast tumor recurrence and probably benign, respectively, in the power Doppler sonography criteria. Sensitivity was higher for power Doppler sonography (94.7±10.0%) than for gray-scale sonography (57.9±22.2%). Specificity was also higher for power Doppler sonography (98.4±3.0%) than for gray-scale sonography (70.3±0.6%). These results suggest that power Doppler sonography can complement gray-scale sonography standardized by BI-RADS in differentiating between IBTR and benign scar lesions.

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