Surgical case reports · 2025
A Case of Pleomorphic Adenoma and Ductal Carcinoma In Situ in the Same Mammary Gland.
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Nagasawa Shiho, Matsui Koshi, Araki Misato, Kanaya Emi, Takagi Kohji, Muranushi Ryo, Shirai Yoshihiro, Watanabe Toru, Miwa Takeshi, Hirano Katsuhisa, Sekine Shinichi, Shibuya Kazuto, Hashimoto Isaya, Yoshioka Isaku, Hirabayashi Kenichi, Fujii Tsutomu
Аннотация
INTRODUCTION: Pleomorphic adenoma is a benign tumor that frequently occurs in the salivary glands; however, it occurs in the breast rarely. There have been few reports of breast cancer complicated by pleomorphic adenoma of the mammary gland.
CASE PRESENTATION: A 70-year-old woman was found to have a mass lesion in her left breast during a medical examination. A needle biopsy was performed, and a diagnosis of pleomorphic adenoma was made. We performed a partial mastectomy with a margin of several millimeters from the tumor. Pathological examination revealed a diagnosis of pleomorphic adenoma with ductal carcinoma in situ. The resection margin was sufficient, and the patient was followed up.
CONCLUSIONS: Pleomorphic adenoma arising in the mammary gland is difficult to differentiate from adenomyoepithelioma, mucocele-like tumor, and metaplastic carcinoma. Since the tumor can become malignant, resection with a narrow margin is recommended, along with special efforts not to damage the capsule at diagnosis.
CASE PRESENTATION: A 70-year-old woman was found to have a mass lesion in her left breast during a medical examination. A needle biopsy was performed, and a diagnosis of pleomorphic adenoma was made. We performed a partial mastectomy with a margin of several millimeters from the tumor. Pathological examination revealed a diagnosis of pleomorphic adenoma with ductal carcinoma in situ. The resection margin was sufficient, and the patient was followed up.
CONCLUSIONS: Pleomorphic adenoma arising in the mammary gland is difficult to differentiate from adenomyoepithelioma, mucocele-like tumor, and metaplastic carcinoma. Since the tumor can become malignant, resection with a narrow margin is recommended, along with special efforts not to damage the capsule at diagnosis.