Step 1: Read the film. The radiograph shows multiple oval radiopaque densities lying centrally in the pelvis at the expected position of the bladder.
Step 2: Interpret the finding. Bladder calculi are typically round or oval, often laminated, and appear as radiopaque shadows in the pelvic midline on a plain KUB. Calcium and magnesium salt stones are radiopaque, so they are visible here.
Step 3: Reject the distractors. A uterine fibroid only calcifies in a popcorn pattern and lies in the soft tissue, not as discrete oval pelvic stones. Bladder carcinoma is a soft tissue mass and is not radiopaque. Renal tuberculosis produces calcification higher up in the kidney, not central pelvic stones. The multiple oval pelvic radiopacities confirm bladder stones.