We report a case of tubular adenoma of the breast, diagnosed as breast fibroadenoma preoperatively, in a 17-year-old woman.
The patient seen at our clinic because of a left breast tumor had a well movable tumor 20×20mm in diameter in the CD area of the left breast on palpation.
Results of ultrasonography and aspiration biopsy cytology suggested fibroadenoma. We excised the tumor under local anesthesia. The tumor was 22×20×18mm in dimension. The histopathological diagnosis was tubular adenoma of the breast.
Tubular adenoma of the breast is a rare benign epithelial tumor of the breast, and so far less than 50 cases have been reported in Japan. Only nine cases, including our case, involved juvenile women aged less than 20 years and accounted for about 23% of all cases. The preoperative diagnosis was fibroadenoma of the breast in most cases and no malignant diseases were suspected before surgery in all nine cases.