. Roentgen interpretation; a manual for students and practitioners . ined with an opaquecatheter in the ureter, preferably stereoscopically, in order to deter-mine the presence or absence of obstruction as well as the relationof the suspected shadow to the ureter. BLADDER. The outline of the partially filled bladder may be made out inmany pelvic plates but may be readily visualized by filling it withair or dilute thorium. Stones in the bladder are occasionally notvisible because a large percentage of them are urates. Importantcharacteristics of bladder stones are that they are of fairly larges


. Roentgen interpretation; a manual for students and practitioners . ined with an opaquecatheter in the ureter, preferably stereoscopically, in order to deter-mine the presence or absence of obstruction as well as the relationof the suspected shadow to the ureter. BLADDER. The outline of the partially filled bladder may be made out inmany pelvic plates but may be readily visualized by filling it withair or dilute thorium. Stones in the bladder are occasionally notvisible because a large percentage of them are urates. Importantcharacteristics of bladder stones are that they are of fairly largesize, are oval, and lie with their long axis transversely in the pelvis. The bladder may be outlined by thorium (usually 10 per cent.)or by air. Large diverticulse are usually well brought out bymoderate distention with thorium. They appear as knobs on eitherside or behind the main shadow and may be larger than the bladderitself. Trabeculation of the bladder wall is sometimes suggestedby irregularity of the outline, particularly along the sides. In some BLADDER 203. Fig. -Diverticulum of the bladder, demonstrated by fillinccollargol. the bladder with


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