Abstract
Pyelorenal backflows which have been often clinically observed by retrograde pyelography are usually classified in the following four types; pyelotubular, pyelo-interstitial, pyelovenous and pyelolymphatic.
These types were found in our corrosion-casting specimen study of the fourteen human kidneys used with acrylic resin, “TECHNOVIT” (Kurzer Co., West Germany) : i. e. red, blue and yellow coloured resins were infused in the artery, vein and ureter, respectively. The fourteen cases in this communication were consisted of following categories.
1) Pyelotubular backflow (seven cases, photo 1). In these specimens the fine structures of the tubuli which were radially distributed on the center of the calyx were observed. These tubuli belong to the collecting ducts and the papillary ducts, and are estimated approximately at 50.400 microns in diameter.
2) Pyelo-interstitial backflow (thirteen cases, photo 2). In these cases, the rocky masses of the acrylic resin around the fornix of the renal calyx were observed.
3) Pyelovenous backflow (thirteen cases, photo 3). The injected acrylic resin teared or ruptured the fornical angle of the renal calm and flowed into the peripapillary veins was observed. Therefore, the arcuate, interlobares, interlobulares and renal veins are filled with resin.
4) Pyelolymphatic backflow (five cases, photo 4). In these specimens, the very fine streaks or threadlike tubuli passing outside the renal fornix were recognized. These countless tubuli are probably the lymphatic vessels, and are estimated at 20.40 microns in diameter.
