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Whenever possible, our surgeons strive to preserve maximal renal function by only removing the tumor and sparing the rest of the involved kidney. A frozen section of the tissue margins of the resected tissue is examined at the time of surgery to make sure that the entire tumor has been removed. Periodic follow up imaging studies are performed to evaluate the remaining kidney. If a tumor should ever recur locally, it is still possible to salvage a cure by removing the remaining kidney. If you wish to learn more about da Vinci® robot-assisted laparoscopic renal surgery, click here, a new window will open. When kidney cancer has spread to elsewhere in the body, multiple types of chemotherapy are often utilized. Although the results of chemotherapy have been disappointing, there is reason for hope. There have been significant advances in the treatment of metastatic kidney cancer. For further information, click here. [Top] Hydronephrosis The cause and degree of obstruction plus the severity of symptoms dictate the type and immediacy of treatment. If hydronephrosis is caused by a stone that is small enough to pass, the situation is usually treated expectantly; that is, with medication, plenty of fluids, and a tincture of time. Similarly, if a UPJ obstruction is asymptomatic , especially if it is mild, it may not require treatment. On the other hand, if there is a severe obstruction of the urinary tract, intervention is usually required. Treatment of a symptomatic stone in the kidney or ureter is discussed elsewhere under the heading of stone disease. Treatment of other types of ureteral and bladder obstruction is beyond the scope of this brief discussion.
The remainder of this section will focus on management of UPJ obstruction. If a UPJ obstruction causes pain, high blood pressure, reduced kidney function, kidney stones, or kidney infection, treatment is recommended. Dismembered Pyeloplasty Traditionally, a symptomatic UPJ obstruction is repaired with open surgery by dismembering (excising) the obstructed area where the ureter enters the renal pelvis. A plastic surgical type of repair is performed to reconnect the severed end of the ureter to the renal pelvis. The success rate of this procedure, which is called a dismembered pyeloplasty, is 95%. In addition to an open surgical repair, AUNC surgeons also ultilize the da Vinci®robot to perform a laparoscopic dismembered pyeloplasty. Both an open and laparoscopic dismembered pyeloplasty are more successful than endopyelotomy procedures (discussed below). The advantages of performing a da Vinci®robot-assisted dismembered pyeloplasty versus an open pyeloplasty repair include:
Endoscopic Pyeloplasty If the UPJ obstruction is caused by a crossing vessel, or if the point where the ureter inserts into the renal pelvis is difficult to access, an open or laparoscopic dismembered pyeloplasty is usually recommended. Otherwise, a minimally invasive procedure, called an endopyelotomy, may be a consideration. Although a variety of techniques and types of medical devises can be used, the common denominator for an endo/pyelo/tomy is dilation and incision (‘otomy’) of the UPJ (‘pyelo’) obstruction. The first step is to pass a specially designed instrument called an endoscope thru the urethra into the bladder. Sterile fluid is used to fill the urinary tract, and a series of mirrors inside the endoscope reflect brilliant light the tip of the instrument, which allows the surgeon to view the inside of the urinary tract. A flexible guide wire is then threaded up the ureter, through the UPJ obstruction, and into the kidney. Correct positioning is confirmed with x-ray guidance. Next a balloon dilation catheter is slid over a guide wire, through the UPJ obstruction, and into the kidney. The balloon portion near the tip of the catheter has markers that can be seen with x-ray; as can the type of fluid that is used to fill the balloon. The initial endoscope is switched out for a tinier version that is called a ureteroscope. A ureterscope is negotiated up the ureter to the level of the UPJ obstruction. Under direct vision, the balloon is carefully positioned so that a wire that is located on the surface of the balloon is directed away from any vessels that may lie outside the ureter. Once everything is properly positioned, electric current is used to create a ‘hot wire’ on the balloon’s surface that incises the narrowed UPJ. Alternatively, a laser fiber can be used to incise the UPJ obstruction. An endopyelotomy can also be performed from above (antegrade), by passing a wire, with x-ray guidance, through a tiny incision in the skin, into the kidney , through the UPJ obstruction, and down the ureter into the bladder. A larger type of balloon catheter is then threaded over the wire into the kidney collecting system. The larger balloon catheter is then inflated with fluid under x-ray guidance, which dilates a tract from the level of the skin into the renal collecting system. Next special sheath is slid over the balloon into the kidney. The endopyelotomy balloon catheter is then positioned through the UPJ. Finally, an endoscope that is inserted through the sheath and into the renal collecting system is used to directly monitor the endopyelotomy procedure. Following an endopyelotomy, a special catheter is temporarily left ‘indwelling’ (inside the urinary system), that extends from inside the bladder, up the ureter, and through the incised UPJ. A catheter may also be positioned from outside the body, through the kidney and UPJ, down the ureter, and into the bladder if an antegrade procedure was performed. Either way, the stent usually remains in place for 6 weeks or so, which allows the ureter time to heal. The success rate of this procedure is around 80-85%. For further information about an endopyelotomy procedure, click here. [Top]
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