ＭＲＩの血流パターンが乳癌との鑑別に有用と考えられた乳腺線維腫症の１例

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  • A CASE OF BREAST FIBROMATOSIS IN WHICH BLOOD FLOW PATTERN IN MRI APPEARED TO BE HELPFUL FOR DIFFERENTIATION FROM BREAST CANCER

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Breast fibromatosis is a rare entity and has been reported in few cases in Japan. This paper describes such a rare case of breast fibromatosis.<br>A 56-year-old woman was seen at the hospital because of an enlarging tumor in the BD area of the right breast which had first been felt since 2 years earlier. The tumor was 10×3cm in diameter and elastic hard. Fixation of the tumor to the chest wall and dermal depression were noted. Ultrasonic scans showed a low echoic mass with heterogeneous margin in the deepest part of the breast. CT scans visualized a low density area suggestive of invasion into the chest wall. However, blood flow pattern in magnetic resonance imaging (MRI) scans was identical with benign pattern. Drill biopsy did not demonstrate tumor components and no definite diagnosis was made. Because a possibility of breast cancer could not be ruled out, an incisional biopsy was carried out when no malignant evidence was obtained by intraoperative frozen section diagnosis. And only the tumor was removed. Histopathological diagnosis was breast fibromatosis.<br>We often have difficulties in differentiating breast fibromatosis from breast cancer on imaging methods. It is thought that blood flow pattern in MRI might be helpful for differentiation between them.

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