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66-year-old man with bladder calculus formed over a hair nidus.
A. Plain radiograph shows serpiginous radiopacity in the lower abdomen (arrows).
B. Intravenous urograph demonstrates round filling defect with linear radiopacity (arrows) in the bladder (arrowheads).
C. Gross appearance of the calculus after extraction shows that serpentine calcification had formed over a hair (arrows).
