Metastatic Spread to Breast in a Case of Mucinous Adenocarcinoma Appendix Detected on 18F-FDG PET-CT scan.

Appendiceal adenocarcinomas are rare invasive gastrointestinal neoplasms, with higher propensity to metastasize to lymph nodes and peritoneum, whereas other common sites include liver and lung. Metastases to the breast are exceptionally rare in appendiceal neoplasms, with limited data in literature. We present the case of a recurrent mucinous adenocarcinoma of the appendix with clinically occult breast, skeletal, and nonregional nodal metastases detected on fluorine-18-fluorodeoxyglucose positron emission tomography-computed tomography scan.