Which imaging modality is preferred for evaluating bladder masses?

The preferred imaging modality for evaluating bladder masses is transabdominal or transvaginal ultrasound. Ultrasound is particularly useful for assessing bladder lesions due to its non-invasive nature, ability to provide real-time imaging, and lack of ionizing radiation. It can effectively help in differentiating between solid and cystic masses, and in assessing their dimensions and anatomical relationships.

Ultrasound has the added benefit of being readily available, easy to perform, and does not require advanced preparation of the patient, making it an efficient first-line imaging technique. It also allows for dynamic assessment, which can be important in evaluating the bladder during filling and voiding.

While CT scans and MRI can provide a more detailed view of the bladder and surrounding structures, they are generally used in specific cases after ultrasound has been performed, particularly when additional information is needed regarding the extent of a mass or for staging cancer. X-rays are not typically used for bladder evaluation due to their limited ability to visualize soft tissue structures and specific lesions.