診断にFDG-PET/CTが有用であった副乳癌合併糖尿病性乳腺症の1例

A case of diabetic mastopathy with accessory breast cancer in which FDG-PET/CT was useful for diagnosis

糖尿病性乳腺症は主に長期糖尿病罹患患者に発症し，超音波検査やマンモグラフィ，MRI検査ではがんとの鑑別が困難な場合がある^1）。病理組織学的には乳腺の高度線維化と小葉，乳管，血管周囲のリンパ球浸潤を特徴とする硬い良性線維性腫瘤病変^2）とされるが，組織が硬いため穿刺吸引細胞診では十分な細胞が得られないことも多い^3）。今回我々は乳癌との鑑別を要した糖尿病性乳腺症に対してFDG-PET/CTを用いて診断しえた1例を経験したため，文献的考察を加えて報告する。

The case was a 78-year-old woman with a history of diabetes. She visited our hospital with a lump in the right axilla. Ultrasonography revealed a mass under in the right axilla and a low echo area in the right breast. The pathological diagnosis of needle biopsy of the right axillary mass was carcinoma. No malignant findings could be confirmed by needle biopsy of lesions in the right breast. FDG-PET/CT showed accumulation of FDG only in the tumor of the right axilla. Based on the above, the patient was diagnosed with diabetic mastopathy with accessory breast cancer. In this case, FDG-PET/CT was useful for distinguishing between cancer and diabetic mastopathy.