Large urinary bladder leiomyoma mimicking malignancy: Using diffusion-weighted imaging as a problem solving tool.

Benign tumors of the urinary bladder are rare and while leiomyomas are the most common type of benign mesenchymal tumors of the bladder, their incidence is low, and most of these tumors are small and asymptomatic. We present a rare case of a large symptomatic urinary bladder leiomyoma in a young female patient referred to a tertiary cancer hospital for management after a suspicion for malignant involvement was raised on initial evaluation, and subsequently, a magnetic resonance imaging was performed. Diffusion-weighted imaging was used as a problem-solving tool to differentiate the tumor from a more common malignant pathology arising from the urinary bladder.