Mucocele-like tumor 様所見を伴った乳腺線維腺腫の 1 例

抄録

We report a rare case of fibroadenoma associated with mucocele-like tumor (MLT)-like changes in a 50-year-old woman whose cytological specimen contained both fibroblastic spindle cells containing mesenchymal and acellular epithelial mucin. Histopathologically, the fibroadenoma contained abundant mesenchymal mucin, and stroma compressing the small surrounding ducts, whose epithelium showed mucinous metaplasia, rupturing the mucus cyst. The definitive diagnosis was fibroadenoma associated with MLT-like changes. Both epithelial components and mucin features should thus be considered in fine-needle aspiration cytology for precisely differentiating diagnosis of the breast.