Bladder Leiomyoma: A Rare Differential and a Potential Pitfall in the Evaluation for a Bladder Mass in 18F-Fluorodeoxyglucose-Positron Emission Tomography/Computed Tomography.

18F-Fluorodeoxyglucose-positron emission tomography/computed tomography (18FDG PET/CT) has shown an increasing role in the evaluation of urinary bladder cancer, though benign pathological processes of the urinary bladder can also result in increased FDG uptake. Leiomyomas of urinary bladder are benign mesenchymal neoplasms and a very rare bladder tumor comprising <0.5% of all bladder tumors. Here, we present the low-grade 18FDG uptake in urinary bladder leiomyoma on PET/CT done for the clinical suspicion of bladder cancer, which can be a rare differential for bladder carcinoma.