ObjectiveTo demonstrate the frequency of malignancy and histological characteristics
of lesions in patients submitted to vacuum-assisted breast biopsy guided by
magnetic resonance imaging (MRI).Materials and MethodsThis was a retrospective study of MRI-guided vacuum-assisted breast biopsies
performed between April 2008 and December 2016, in which we analyzed
clinical and epidemiological data, as well as the BI-RADS classification and
histopathological results. We compared nodules and non-nodular enhancements,
in terms of their correlation with malignancy, using chi-square test.ResultsAmong 215 cases referred for MRI-guided vacuum-assisted breast biopsy, the
procedure was contraindicated in 10 cases (5%) and was technically feasible
in the remaining 205 (95%). Non-nodular enhancements were observed in 135
cases (66%), and nodules were observed in 70 (34%), with a mean diameter of
2.2 cm (range, 0.5-9.6 cm) and 0.97 cm (range, 0.5-2.2 cm), respectively. Of
the 205 lesions analyzed, 43 (21%) were malignant, 129 (63%) were benign,
and 33 (16%) were classified as high-risk lesions. The most common
histological findings were invasive ductal carcinoma and, in high-risk
cases, lobular neoplasia. There was no significant difference between
nodules and non-nodular enhancements in terms of the rate of malignancy
(p = 0.725).ConclusionIn our sample, the overall malignancy rate was 21%. However, to improve the
assessment of these results, it is necessary to correlate them with the
surgical data and with data from the follow-up of benign cases.