Ureteral Trauma

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Damage to ureters can result from iatrogenic injury or from external trauma, especially penetrating trauma. [1] Iatrogenic ureteral injury usually involves abdominopelvic surgery or ureteroscopy. Ureteral injuries due to external trauma are rare, as the ureter is well-protected in the retroperitoneum by the bony pelvis, psoas muscle, and vertebrae. Damage to the ureter usually results from a significant traumatic event that is almost always associated with concomitant injury to other abdominal structures. Much of the presentation and management of ureteral injuries are dictated by the severity and management of the associated injuries.

This article discusses the etiology, presentation, evaluation, and management of ureteral injuries.

For patient education information, see the Kidneys and Urinary System Center, as well as Blood in the Urine and Intravenous Pyelogram.

Ureteral trauma was first reported in 1868 by Alfred Poland, when a 33-year-old woman died 6 days after being pinned between a platform and a railway carriage. At autopsy, the right ureter was avulsed below the renal pelvis. [2] Henry Morris described the first ureteral procedure in 1904, when he performed an ureterectomy on a 30-year-old man who “fell from his van catching one of the wheels across his right loin.” [3]

While injuries to the ureter can result from external trauma, iatrogenic causes are more common. These are usually associated with abdominopelvic surgery or ureteroscopy. In addition to intraoperative injury, the ureter can be secondarily affected by postoperative fibrotic or inflammation reactions. Iatrogenic injuries are typically isolated and thus tend to present differently from those associated with external violence.

The American Association for the Surgery of Trauma has classified ureter injuries. The following is the ureter injury scale, [4] which includes the grade of injury, type of injury, and description of injury:

Grade I – Hematoma; contusion or hematoma without devascularization

Grade II – Laceration; less than 50% transection

Grade III – Laceration; 50% or greater transection

Grade IV – Laceration; complete transection with less than 2 cm of devascularization

Grade V – Laceration; avulsion with greater than 2 cm of devascularization

With bilateral involvement, the injury is advanced one grade, up to grade III.

Over the past several decades, the percentage of genitourinary injuries caused by external trauma in which the ureter is involved has increased from less than 1% to 2.5%. The increase in incidence may be directly related to an increase in survival of severely injured trauma patients. Increased survival from other more deadly injuries and increased use of imaging allows for diagnosis of ureteric injury. [5, 6]

External trauma can be penetrating (ie, gunshot wounds, stab wounds) or blunt. Interestingly, when all penetrating and blunt traumas were evaluated, the ureter was damaged in less than 4% and 1% of cases, respectively. The type of external trauma also matters; gunshot wounds accounted for 91% of injuries, with stab wounds and blunt trauma accounting for 5% and 4%, respectively. [7]

The relative frequency of ureteral involvement in gunshot trauma is related to the mechanism of the injury. Ballistic injuries affect the ureter in two ways. First, they may directly injure the ureter with varying degrees of severity, ranging from a contusion to complete transection. Secondly, the intramural blood supply of the ureter may be disrupted, resulting in ureteral necrosis. Microvascular studies have shown that this damage may extend as far as 2 cm above and below the point of transection, suggesting that the zone of bullet-associated ureteral injuries extend beyond what is observed grossly. Fortunately, fewer than 3% of gunshot injuries involve the ureters.

Stab wound–related injuries to the ureter are less common than those caused by gunshot injuries. Nevertheless, long-bladed weapons or stab wounds posterior to the midaxillary line should always raise suspicion for possible ureteral involvement.

Blunt trauma can cause ureteral injury from several mechanisms. These mostly involve deceleration or acceleration mechanisms with sufficient force to disrupt the ureter from either the ureteropelvic or ureterovesical junctions. Such injuries can result from a high-speed motor-vehicle collision, a fall from a significant height, or a direct blow to the region of the L2-3 vertebrae.

Risk factors for ureteral injury during open surgery include any condition with the potential to alter the expected course of the ureter, such as the following:

Iatrogenic ureteral injury may result from any of the following:

Gynecologic surgery

Abdominal hysterectomy was once the most common cause of iatrogenic ureteral injury (see the image below). However, ureteral injuries can occur during any abdominopelvic surgery.

Approximately 52%-82% of surgical ureteral injuries occur during gynecologic procedures. Hysterectomy accounts for most of these cases. However, the modality used plays a role: ureteral injury occurs 1.3%-2.2% of abdominal hysterectomies and in only 1.3% and 0.03% of laparoscopic and vaginal hysterectomies, respectively. [8, 9, 10, 11, 12] The risk factors for ureteral injury in these cases include a large uterus, pelvic organ prolapse, and prior pelvic surgery.

The injury typically occurs in the distal ureter in the region of the infundibulopelvic ligament or where a ureter crosses inferior to the uterine artery, often from blind clamping and ligature placement to control hemorrhage. During laparoscopic gynecologic procedures, ureteral injury most commonly results from cauterization or clipping. Interestingly, 33-87% of ureteral injuries caused during laparoscopic surgery are not recognized at the time. [13, 14, 15, 12, 16, 17, 18]

Colorectal surgery

After gynecologic procedures, colorectal surgery is the next most common cause of iatrogenic ureteral injuries. Together, low anterior resection (LAR) and abdominal perineal resection (APR) account for 9% of all such incidences in a combined series and 67% of all general surgical injuries. The incidence of ureteral injury during LAR or APR is 0.3%-5.7% [19] and appears to be rising. [20] The left ureter is involved more commonly than the right, as it may be elevated with the sigmoid mesentery and mistaken for a mesenteric vessel.

Vascular surgery

The overall incidence of ureteral involvement during vascular surgery has been reported as 2%-4%. Ureteral injury may result from direct injury during the procedure or may present as a fistula or hydronephrosis postoperatively. Patients undergoing repeat aortoiliac surgery appear to be at the greatest risk for ureteral injury.

The incidence of asymptomatic hydronephrosis after abdominal vascular surgery has been estimated to be as high as 20%, while only 2% of cases are symptomatic. Of those who are symptomatic, 35% present within 2 months, 50% within 12 months, and 18% after 5 years. [21] Risk factors include ureteral devascularization, retroperitoneal fibrosis, radiation exposure, graft infections, graft dilations, false aneurysms, and anterior graft placement. In patients with early obstruction (< 6 mo), it tends to resolve spontaneously.

Another condition related to vascular surgery is the development of an aortoureteric or graft-ureteric fistula, which can lead to massive hematuria and vascular collapse. The risk factors for the development of the fistulae include anterior graft placement, prolonged use of a ureteral stent, compression, and obstruction.

Urologic procedures

Ureteral injuries that occur during urologic procedures are becoming increasingly common. In one series, they comprised 42% of all iatrogenic injuries. [22] The increased incidence of ureteral injuries during urologic procedures is directly related to the increased use of ureteroscopic equipment. Endoscopic procedures accounted for 79% of injuries, while open surgery accounted for 21%. Most of these injuries occurred in the distal ureter (87%). [22]

The injuries include perforation, stricture, avulsion, false passage, intussusception, and prolapse into the bladder. Risk factors for these injuries include radiation, tumor, inflammation, and impacted stones.

Injury also may be related to the equipment used, such as wires, baskets, and lithotriptors (eg, electrohydraulic lithotriptor [EHL]). Ureteroscopy procedures with ureteral access sheath can also cause ureteral wall injury. [23]

Ureteral injuries during robot-assisted prostatectomies are uncommon. In a series of 6442 consecutivepatients, ureteral injury occurred in three patients [24] .

The increasing use of thermoablation and cryoablation for renal tumors have placed the ureter is at risk for injury. This risk is theoretically higher for lower pole and medially located tumors.

Other iatrogenic causes

Other surgical procedures that may injure the ureters include spinal surgery for disc disease, vaginal surgery for pelvic prolapse, and appendectomy.

Radiation injury to the ureter is rare. The ureter is more resistant to the effects of radiation than the bladder. The incidence of ureteral obstruction due to radiation is 0.04%, while the incidence of obstruction due to recurrent tumor is 95%.

The key to managing any ureteral injury, regardless of its etiology, is maintaining a high index of suspicion.

Most iatrogenic injuries (70%-80%) are diagnosed postoperatively. The presenting signs and symptoms may include the following [11] :

Other rare but reported injuries include an aortoureteric or graft-ureteric fistula, which may present as mild-to-massive gross hematuria, or a silent obstruction, which can present later as hypertension and nephrotic syndrome.

Again, with the patient’s history in mind, a carefully performed physical examination may be revealing. The following findings are especially suggestive:

In patients with external trauma, ureteral involvement may not be obvious, especially when associated with multiorgan involvement. Therefore, the diagnosis of a ureteral injury may be delayed as other critical injuries are addressed. Nevertheless, as discussed above, a high index of suspicion for ureteral involvement must be maintained.

The choice of treatment is based on the location, type, extent, and timing of presentation, as well as the patient’s medical history, overall condition, and survival prognosis (see Surgical therapy).

The ureters are peristaltic tubular structures that course from the kidney to the bladder in the retroperitoneum. Histologically, they are composed of an outer serous layer, a smooth muscle layer, and an inner mucosal layer. The smooth muscle layer consists of 2 circular layers separated by a longitudinal layer.

The ureters can be divided into 3 segments: proximal; middle; and pelvic, or distal. The proximal ureter is the segment that extends from the ureteropelvic junction to the area where the ureter crosses the sacroiliac joint, the middle ureter courses over the bony pelvis and iliac vessels, and the pelvic or distal ureter extends from the iliac vessels to the bladder. The terminal portion of the ureter may be subdivided further into the juxtavesical, intramural, and submucosal portions.

The ureters are at risk during open surgery because of their proximity to many abdominal and pelvic structures. They lie anterior to the psoas muscles and adhere to the posterior peritoneum. The left ureteropelvic junction is posterior to the pancreas and duodenal-jejunal junction. On the right, it lies posterior to the duodenum and just lateral to the inferior vena cava (IVC). The left ureter is crossed anteriorly by the inferior mesenteric artery and sigmoidal vessels. The right ureter is crossed by the right colic and ileocolic vessels. As they descend into the pelvis, the ureters course anterior to the iliac vessels but posterior to the gonadal vessels.

In males, the ureter is crossed anteriorly by the medial umbilical ligament. Before entering the bladder, the ureter passes under the vas deferens.

In females, the ureter courses posterior to the ovary, lateral to the infundibulopelvic ligament, and medial to the ovarian vessels. It then passes posterior to the broad ligament and lateral to the uterus. As the ureter approaches the bladder, it is about 2 cm lateral to the cervix. The uterine vessels run just anterior to the ureter near the ureterovesical junction. Most commonly, the ureter is injured in the ovarian fossa near the infundibulopelvic ligament and where the ureter courses posterior to the uterine vessels.

The ureteric arteries course in the adventitia longitudinally. They are supplied by branches from the renal, aortic, gonadal, iliac, and vesical arteries. The ureteric arteries are continuous in 80% of cases. In the abdominal portion, the blood supply is derived medially, and, in the pelvis, the blood supply comes from the lateral aspect. The richest blood supply is to the pelvic ureter.

Lymphatic drainage from the ureter drains to regional lymph nodes. No continuous lymph channels extend from the kidney to the bladder. The regional nodes that serve as drainage include the common iliac, external iliac, and hypogastric lymph nodes.

Contraindications to ureteral repair vary according to the specific procedure, as follows:

Relative contraindications to a vesicopsoas hitch include small-capacity bladders (eg, neurogenic bladder, irradiated bladders) and evidence of significant bladder outlet obstruction.

Relative contraindications to a Boari bladder flap include small, contracted, irradiated, and neuropathic bladders; transitional cell carcinoma; and previous bladder mobilization that threatens the blood supply to the pedicle.

The absolute contraindications to transureteroureterostomy (TUU) include a short donor ureter or a diseased recipient ureter. Relative contraindications include a urothelial tumor, nephrolithiasis, pelvic or abdominal irradiation, retroperitoneal fibrosis, and ureteral injury caused during aortoiliac bypass surgery.

Autotransplantation is contraindicated in patients who are older than 60 years and in those with underlying aortoiliac atherosclerosis or renal disease. The presence of retroperitoneal fibrosis is a relative contraindication because of the potential of venous obstruction.

Contraindications to ileal ureteral substitution include a serum creatinine level of greater than 2 mg/dL, neurogenic bladder, bladder outlet obstruction, inflammatory disease, radiation enteritis, and hepatic dysfunction.

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Richard A Santucci, MD, FACS Specialist-in-Chief, Department of Urology, Detroit Medical Center; Chief of Urology, Detroit Receiving Hospital; Director, The Center for Urologic Reconstruction; Clinical Professor of Urology, Michigan State University College of Medicine

Richard A Santucci, MD, FACS is a member of the following medical societies: American College of Surgeons, International Society of Urology, American Urological Association

Disclosure: Nothing to disclose.

Craig B Hunter, DO Resident Physician, Department of Urology, Detroit Medical Center

Craig B Hunter, DO is a member of the following medical societies: American College of Surgeons, American Osteopathic Association, American Urological Association, American College of Osteopathic Surgeons, Sigma Sigma Phi

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Shlomo Raz, MD Professor, Department of Surgery, Division of Urology, University of California, Los Angeles, David Geffen School of Medicine

Shlomo Raz, MD is a member of the following medical societies: American College of Surgeons, American Medical Association, American Urological Association, California Medical Association

Disclosure: Nothing to disclose.

Bradley Fields Schwartz, DO, FACS Professor of Urology, Director, Center for Laparoscopy and Endourology, Department of Surgery, Southern Illinois University School of Medicine

Bradley Fields Schwartz, DO, FACS is a member of the following medical societies: American College of Surgeons, American Urological Association, Association of Military Osteopathic Physicians and Surgeons, Endourological Society, Society of Laparoendoscopic Surgeons, Society of University Urologists

Disclosure: Serve(d) as a speaker or a member of a speakers bureau for: Cook Medical; Olympus.

Allen Donald Seftel, MD Professor of Urology, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School; Head, Division of Urology, Director, Urology Residency Training Program, Cooper University Hospital

Allen Donald Seftel, MD is a member of the following medical societies: American Urological Association

Disclosure: Received consulting fee from lilly for consulting; Received consulting fee from abbott for consulting; Received consulting fee from auxilium for consulting; Received consulting fee from actient for consulting; Received honoraria from journal of urology for board membership; Received consulting fee from endo for consulting.

Heinric Williams, MD Resident Physician, Department of Urology, Harper Hospital, Wayne State University School of Medicine

Heinric Williams, MD is a member of the following medical societies: American College of Physicians-American Society of Internal Medicine, American College of Surgeons, and American Urological Association

Disclosure: Nothing to disclose

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