Urinary bladder involvement in rectal adenocarcinoma: An unusual site of metastasis

Colorectal cancer represents one of the most common malignancies worldwide, typically metastasizing to the liver, lungs, peritoneum, lymph nodes, and bones. Metastatic involvement of the urinary bladder, however, remains exceptionally rare. We report a case of a 52-year-old female with rectal adenocarcinoma who initially underwent neoadjuvant chemotherapy followed by concurrent chemoradiation. Subsequently, she developed persistent urinary tract infections and lower abdominal discomfort. Diagnostic cystoscopy and biopsy confirmed metastatic spread to the urinary bladder.