RESUMO
INTRODUCTION: Metastatic adenocarcinoma to the appendix is an uncommon finding, there are few published cases in the literature of appendicitis from metastatic breast carcinoma. PRESENTATION OF CASE: A 51-year-old female was admitted to the emergency department with a presumptive diagnosis of acute appendicitis with a past medical history of stage IV Breast Cancer 12 years ago. Appendectomy was performed, finding a perforated appendix. Anatomo-pathology examination revealed a semi-differentiated carcinoma involving the tip of the appendix. DISCUSSION: Gastrointestinal tract (GIT) metastases of breast carcinoma are an uncommon finding. Appendiceal metastases are a very uncommon finding, and the interval between diagnosis of the primary carcinoma and the metastases can be many years. There are no reports about whether right hemicolectomy provides better oncological outcomes than an appendectomy in stage IV BC. CONCLUSION: There are no guidelines for the management of this disease but unquestionably, multidisciplinary management leads to better outcomes.