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Rectovesical fistula: anorectal endosonographic view of a fistulous orifice in the urinary bladder (arrows) (a), transrectal ultrasonographic view of a fistulous orifice (arrows) located 6 mm from the internal outlet of the bladder (crosses) (b), and transrectal ultrasonographic view of a fistulous tract adjacent to the left lobe of the prostate (arrows) (c).
