A case of locoregional recurrence of breast cancer in the interpectoral lymph nodes—an unusual location

This case report describes a case of isolated locoregional recurrence of breast cancer in the interpectoral lymph nodes (IPN). The IPN are located in between the pectoralis major and minor and represent a potential site for recurrence of breast cancer, however these events are extremely rare and there are only a few, older publications on the subject.