浅利 貞毅¹, 山崎 元¹, 山崎 芳郎¹, 奥野 慎一郎¹, 桑田 圭司¹, 山崎 大², 小林 晏²

Sadaki ASARI¹, Hajime YAMASAKI¹, Yoshio YAMASAKI¹, Shinichirou OKUNO¹, Keiji KUWATA¹, Masaru YAMASAKI², Yasushi KOBAYASHI²

¹大阪厚生年金病院外科, ²同病理科

¹Department of Surgery, Osaka Koseinenkin Hospital, ²Department of Pathology, Osaka Koseinenkin Hospital

キーワード : Adenomyoepithelioma, Breast, Mammography, Ultrasonography

The patient was a 66-year-old woman with adenomyoepithelioma in the lower outer quadrant of the left breast. A 2.0-cm mass was discovered in the left breast during abdominal CT examination for colonic polyps. Ultrasonographic findings indicated a malignant tumor with an irregular shape, rough margin, heterogeneous internal echo, and high D/W ratio. Mammography, on the other hand, suggested a benign tumor with a clear margin and homogeneous shadow, but no spicules or calcification. Aspiration cytology showed a class Ⅲ tumor. To make a definitive diagnosis, excisional biopsy was performed under general anesthesia, and there were no malignant features in a frozen section. The final pathologic diagnosis was adenomyoepithelioma. Ultrasonography may have shown a malignant pattern with hypoechoic, coarse, and heterogeneous internal echoes because of the histologic mixture of epithelial and myoepithelial cells. We conclude that aspiration cytology, core needle biopsy, and excisional biopsy should be used to make the final diagnosis of breast tumor and avoid unnecessary surgery when ultrasonographic findings do not agree with mammographic findings.