Focal Fibrosis of the Breast Diagnosed by Core Needle
Biopsy under Imaging Guidance
Cholatip Wiratkapun MD*, Orapin Chansanti MD*,
Bussanee Wibulpolprasert MD*, Panuwat Lertsittichai MD, MSc**
Affiliation :
* Department of Radiology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
** Department of Surgery, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
Background : Focal fibrosis of the breast is an uncommon pathology, recognition of this lesion is important because it could
mimic malignant lesions on both mammogram and ultrasonography (US). Concordance with the pathology result from core
needle biopsy (CNB) and follow-up are essential to avoid false negative
Objective : To characterize the mammographic and US features of focal fibrosis of the breast and to estimate the false
negative rate for breast cancer when focal fibrosis was diagnosed by CNB.
Material and Method: The subjects were 82 patients diagnosed fibrosis of the breast by CNB during 7-year period.
Results : Of 38 mammographic visible lesions there were mass lesions in 12 (32%), calcifications in 14 (37%), mass with
calcifications in four (11%), architectural distortion in one (3%) and asymmetrical density in seven (18%). Most of the
lesions seen on the US were hypoechoic mass (81%). The suspicious features, which warrant CNB, included irregular shape
in 37 (55%), indistinct margin in 38 (57%), and posterior shadowing in 28 (42%). Most of the lesions were categorized as
Breast Imaging Reporting and Data System (BI-RADS) 4A (59%). Thirteen cases underwent surgical biopsy and all showed
benign pathologic results. No false-negative cases were detected.
Conclusion : Focal fibrosis had some features similar to malignant lesion. CNB showed reliable pathological result. No
false negative result was found in the present study.
Keywords : Breast, Focal fibrosis, Core needle biopsy, Mammogram, Ultrasound
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