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Mammographic features predicting an extensive intraductal component in early-stage infiltrating ductal carcinoma.

Several studies have shown that the presence of an extensive intraductal component in patients with infiltrating ductal carcinoma is a major factor for predicting local recurrence after breast-conserving surgery and radiotherapy. A prospective study of 101 consecutive mammograms in patients with stage I or II infiltrating ductal carcinoma was performed to determine the predictive values of mammographic features in determining the presence or absence of an extensive intraductal component. Thirty-five (35%) of the lesions contained a pathologically verified extensive intraductal component. Sixty-five percent (22/34) of lesions showing mammographic evidence of calcifications with or without a mass were associated with an extensive intraductal component (p less than .001). Lesions with calcifications greater than 3 cm in extent were significantly (p less than .05) more likely to have an extensive intraductal component (9/10; 90%) than those with calcifications less than 3 cm in extent (13/24; 54%). Only 17% (8/46) of patients in whom mammograms showed only a mass or architectural distortion and 24% (5/21) of patients who had a mass palpable clinically or who had normal findings on mammograms had lesions with an extensive intraductal component. We conclude that infiltrating ductal carcinomas associated with calcifications on mammography, especially if the calcifications are extensive, are likely to be associated with an extensive intraductal component. Carcinomas without calcifications that show masses or architectural distortion on mammography, or carcinomas with palpable masses and normal findings on mammography, are unlikely to have an extensive intraductal component.