TITLE:
Invasive Ductal Carcinoma near the Site of a Previously Excised Patient-Reported Benign Breast Tumor in a 93-Year-Old Male: A Case Report
AUTHORS:
Gavin Crist, Jeffrey D. Goodwin, Joseph Davenport, Benjamin Brooks
KEYWORDS:
Male Breast Cancer, Invasive Ductal Carcinoma, Benign Breast Tumor, Gynecomastia, Mastectomy, Sentinel Node Biopsy, BRCA, Case Report
JOURNAL NAME:
Case Reports in Clinical Medicine,
Vol.15 No.9,
September
15,
2026
ABSTRACT: Background and Clinical Significance: Male breast cancer is rare, representing less than 1% of breast carcinomas diagnosed annually in the United States. Invasive ductal carcinoma is the most common histologic subtype in men. Prior benign breast disease is associated with later breast cancer risk in women, but corresponding data in men are limited. This case describes invasive ductal carcinoma in a 93-year-old man with a remote history of ipsilateral breast tumor excision. Case Presentation: A 93-year-old male presented with newly diagnosed left breast cancer confirmed by diagnostic mammogram, ultrasound, and biopsy. His history included left-sided gynecomastia at age 20 treated without surgery and a patient-reported teratoma excised from the left breast in his late 50s. Mammogram showed an equal-density circumscribed round mass in the central left breast. Ultrasound showed a parallel mixed-echogenicity 3.5 cm mass with normal-appearing lymph nodes. Biopsy demonstrated grade 2 invasive ductal carcinoma, estrogen receptor positive, progesterone receptor positive, HER2 negative, Ki-67 15%, and Magee score 14. The patient underwent left mastectomy and sentinel node biopsy. Final pathology confirmed stage IIA disease, pT2N0, with margins greater than 10 mm and 0 of 6 lymph nodes involved. Conclusions: This case reinforces that new male breast masses require careful evaluation, even with a remote history of benign breast disease or prior breast surgery.