. Annals of surgery. A hydro-ureter extending from the bladderto a hydronephrotic pelvis. The irregular retracted pelvis occurring in a bilateral cyikidnev. DEVELOPMENTS IN PYELOGRAPHY. 647 the existence and extent of a dilated pelvis, providing thatthe catheter is able to pass the etiological ureteral obstruction.However, it is always more satisfactory and of great con-firmatory value, at least, to visibly demonstrate the dilatation.Furthermore, when the catheter meets an impassable obstruc-tion, enough collargol can frequently be injected past theconstriction to outline the pelvis enlargemen

. Annals of surgery. A hydro-ureter extending from the bladderto a hydronephrotic pelvis. The irregular retracted pelvis occurring in a bilateral cyikidnev. DEVELOPMENTS IN PYELOGRAPHY. 647 the existence and extent of a dilated pelvis, providing thatthe catheter is able to pass the etiological ureteral obstruction.However, it is always more satisfactory and of great con-firmatory value, at least, to visibly demonstrate the dilatation.Furthermore, when the catheter meets an impassable obstruc-tion, enough collargol can frequently be injected past theconstriction to outline the pelvis enlargemen

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. Annals of surgery. A hydro-ureter extending from the bladderto a hydronephrotic pelvis. The irregular retracted pelvis occurring in a bilateral cyikidnev. DEVELOPMENTS IN PYELOGRAPHY. 647 the existence and extent of a dilated pelvis, providing thatthe catheter is able to pass the etiological ureteral obstruction.However, it is always more satisfactory and of great con-firmatory value, at least, to visibly demonstrate the dilatation.Furthermore, when the catheter meets an impassable obstruc-tion, enough collargol can frequently be injected past theconstriction to outline the pelvis enlargement quite definitely.Fig. 3 illustrates a moderate pelvis outlined under such con-ditions. With the overdistention method the condition couldnot be demonstrated because of the immediate return flow ofmost of the injected fluid. On the other hand, there areundoubtedly hydronephroses which will not appear as suchin the injected radiograph. This is particularly true when thedilation is largely confined within the contour