. 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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