2014 Volume 60 Issue 4 Pages 349-352
We herein present the case of a-58-year-old female with a metastasis of breast cancer to the appendix, which caused acute appendicitis. She had undergone a bilateral partial mastectomy with sentinel lymph node biopsy ten years earlier at another hospital. She had subsequently received radiation therapy, chemotherapy and endocrine therapy. There had been no sign of recurrence for five years after the surgical procedure. She was admitted to our hospital because of abdominal pain lately. Abdominal computed tomography showed a dilated and thickened wall of the appendix. She was diagnosed with acute appendicitis and underwent appendectomy. A histopathological examination revealed metastatic breast cancer of the appendix, and the patient received endocrine therapy using an aromatase inhibitor. Metastatic involvement of the appendix should be suspected in any patient with a previous history of breast cancer presenting with acute appendicitis, even if many years have passed after initial therapy.