Malignant rectal strictures are uncommon, but they may pose a diagnostic challenge in clinical practice. We report the case of an 85-year-old male with an initially puzzling presentation of abdominal distention and discomfort. The patient was ultimately diagnosed with a rectal stricture caused by a plasmacytoid variant of urothelial cell carcinoma originating from the bladder. This case emphasizes the necessity of considering unique etiologies when evaluating rectal strictures and the aggressive character of this type of urothelial carcinoma.