軟骨肉腫様成分が主体を占めた乳腺化生癌の１例

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  • Metaplastic carcinoma of the breast mainly composed of chondrosarcomatous component.

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Background: Breast carcinoma with cartilaginous and/or osseous metaplasia is a rare tumor, and the findings of aspiration cytology remain poorly defined.<BR>Case: A 47-year-old woman was referred to our hospital because of a rapidly growing left breast tumor. Aspiration cytology from the tumor revealed scattered multiple malignant chondromatous cells as well as a few sheets of benign ductal cells in the chondromatous matrix. These strongly suggested a malignant phyllodes tumor. A simple mastectomy with axillary lymph node dissection was performed. The excised tumor was 8×4×11 cm in size, white in color, and diffusely invaded to skin and adipose tissue. Histologically, the tumor was primarily composed of malignant chondromatous cells with various levels of differentiation, and with gradual differentiation into invasive ductal carcinoma in a few areas. The diagnosis of carcinoma with cartilaginous metaplasia was made. Misinterpretation of aspiration cytology findings was explained by the histological finding that chondrosarcomatous cells were mainly growing by lymph vessel invasion, preserving breast ductal architecture.<BR>Conclusion: A breast carcinoma with cartilaginous metaplasia in which aspiration cytology suggested malignat phyllodes tumor was reported.

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