Accessory Breast Cancer of the Right Axillary Region: A Case Report and Review of Management

Accessory breast tissue results from failure of the embryologic mammary ridge, also known as the milk line, to involute. Because of the low incidence of these cases in the population and the lack of a fixed location for the tumor to occur. Case Presentation: Here we present a female patient, 51 years old, who was born with a swelling on the side of the arm in the right axilla that grew with age. Three years ago, a lump the size of an egg was found protruding from the body and gradually ulcerating. Conclusion: Ultrasound assisted examination revealed that the patient had right axillary lymph node enlargement and Pathological diagnosis of accessory breast cancer. The early stage of accessory breast cancer mostly presents only as a painless mass. Therefore, when an abnormality is detected in the early stage, it should be checked out promptly to avoid deterioration.