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乳腺の低悪性度(線維腫症様)紡錘細胞癌は,紡錘細胞癌の一亜型であり,WHO分類(第4版)で化生癌の項目に入るまれな組織型の乳腺腫瘍である。今回我々は,画像的に悪性腫瘍が疑われたにもかかわらず,針生検では癌細胞を認めず,腫瘍摘出生検後に低悪性度(線維腫症様)紡錘細胞癌と診断された症例を経験した。
We report a case of low grade(fibromatosis-like)spindle cell carcinoma of the breast. Mammography showed a dense mass in the left breast. Ultrasonography revealed a well-circumscribed hypoechoic mass. MRI showed a solid mass with an early peripheral enhancement and a central nonenhancing area. Although these findings suggested breast carcinoma, the core needle biopsy showed no malignancy. The histopathological examination following the tumor excision diagnosed low grade(fibromatosis-like)spindle cell carcinoma, which is a rare breast tumor categorized as a subset of metaplastic carcinoma.
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