Mucinous Appendiceal Adenocarcinoma Presenting as Sister Mary Joseph Nodule: Case Report and Brief Review of Literature

Sister Mary Joseph nodule is a rare form of umbilical metastasis. Often, this is the only initial presenting sign for an underlying internal malignancy and is usually associated with poor prognosis. Although the gastrointestinal tract is the most common primary site, the majority of these metastases are from gastric and colorectal sites. We report a case of Sister Mary Joseph nodule in a patient with no GI complaints. Further evaluation led to the diagnosis of primary mucinous adenocarcinoma of the appendix. Primary mucinous adenocarcinoma of the appendix is a very rare tumor type that can give rise to umbilical metastases. To the best of our knowledge, only 3 cases of adenocarcinoma of the appendix metastasizing to the umbilicus have been reported in the medical literature.