鯨岡 結賀¹, 臺 勇一², 市岡 恵美香³, 池田 達彦⁴, 原 尚人⁴

Yuka KUJIRAOKA¹, Yuichi DAI², Emika ICHIOKA³, Tatsuhiko IKEDA⁴, Hisato HARA⁴

¹筑波記念病院放射線科, ²筑波記念病院病理診断科, ³筑波大学附属病院乳腺甲状腺内分泌外科, ⁴筑波大学医学医療系乳腺甲状腺内分泌外科

¹Department of Radiology, Tsukuba Memorial Hospital, ²Department of Pathology, Tsukuba Memorial Hospital, ³Department of Breast-Thyroid-Endocrine Surgery, Tsukuba University Hospital, ⁴Department of Breast-Thyroid-Endocrine Surgery, University of Tsukuba Institute of Clinical Medicine

キーワード : cholesterol granuloma, breast, color Doppler, twinkling artifact

カラードプラ法でtwinkling artifactを呈した乳房コレステリン肉芽腫の1例を報告する．症例は45歳，女性．左乳房腫瘤を自覚して来院．超音波検査Bモード法で円形の境界明瞭平滑な低エコー腫瘤を認めた．カラードプラ法にて腫瘤の表層に複数のtwinkling artifactを認めた．マンモグラフィでは病変部に，微小円形石灰化を数個認めるのみであり，コレステリン結晶がtwinkling artifactの要因と推測された．Twinkling artifactを呈する乳房腫瘤ではコレステリン結晶の存在も考える必要があると思われる．

We herein report a case of breast cholesterol granuloma that presented the twinkling artifact on color Doppler sonography. The patient was a 45-year-old woman who complained of a lump in her left breast. B-mode ultrasonography showed it to be a round, well-circumscribed hypoechoic mass. Some twinkling artifacts were seen on the surface of the tumor on color Doppler ultrasonography. Mammography showed a few tiny calcifications only. Cholesterol crystals are considered to be the cause of the twinkling artifact. A cholesterol granuloma should be considered in the differential diagnosis when encountering a breast tumor presenting the twinkling artifact.