English: Three markers were placed to mark the tumor site of a patient with unifocal T2 disease. Immediately after placement, under Fluoroscopy, the empty bladder was filled and then emptied (via a urethral catheter) with dilute contrast in serial increments of 60 ml. (filling: 0 ml. to 240 ml, followed by emptying: 240 ml to 0 ml.) A Fluoroscopic image of bladder was recorded at each volume. So that the location of all markers could be easily compared relative to one another and to bony landmarks, the position of the Fluoroscopy unit and patient were fixed in space throughout imaging, so that the only source of movement was the patient's bladder and GI motility. Comparisons of images of the fiducial markers within the bladder while the latter was filled with an equal volume of either saline versus diluted contrast confirms that the markers move with the bladder-wall as the bladder expands and contracts during filling and emptying. Also, rapid serial images of the bladder were captured while holding intravesical volume constant. These images show how both the abdominal wall, intestines and the bladder-wall move in 3D with visceral peristalsis and inspiration.