External Iliac Artery Anastomosis and Internal Iliac Artery Anastomosis for Artery anastomosis in Deceased-donor Kidney Transplantation and Multifactorial Analysis of Graft Survival.

OBJECTIVE: To determine the effects of surgical techniques applied to arterial anastomosis for kidney transplantation on the graft outcome. STUDY DESIGN: Observational study. PLACE AND DURATION OF STUDY: Organ Transplantation Center, Ataturk University Research Hospital and School of Medicine, Erzurum, Turkey, from January 2010 to January 2020. METHODOLOGY: In total, 143 consecutive patients who underwent deceased-donor-donor kidney transplantation during a 10-years period were retrospectively analysed. All patients were divided into two groups according to the vascular anastomosis techniques (end-to side external iliac and end-to-end internal iliac). The two groups were compared in terms of urine volume on postoperative days 1 and 7; blood creatinine levels on postoperative days 1, 2, and 7; complications; and graft survival. RESULTS: The mean patient age was 42.04 ± 11.1 years. No significant difference was observed between creatinine values ​​and urine amounts for both surgical techniques (p >0.05). Only the amount of urine on the postoperative 7th day had a significant effect on graft survival (p <0.05). There was no significant difference between the two anastomosis techniques in terms of graft survival (p >0.05). CONCLUSION: Both surgical techniques can be used safely in renal transplantation and arterial anastomosis. Also, decreased urine volume during follow-up can be considered as an early indicator of graft loss in the long-term. KEY WORDS: Kidney transplantation, Surgical anastomosis, Delayed graft function, Graft survival.

Successful Endovascular Repair of Infectious External Iliac Artery Anastomotic Pseudoaneurysm With Graft Preservation Post-Kidney Transplantation: Case Report and Review of Literature.

BACKGROUND: Allograft artery-infected pseudoaneurysm (PA) represents a rare but life-threatening complication of kidney transplantation (KT). A review of the literature, showed that nearly all these cases ended resulted in graft loss. We presented a case of post-KT-infected external iliac artery anastomotic PA successfully managed by endovascular stenting with graft preservation. Additionally, we reviewed the pertinent literature. METHOD: In this article, we described a hypertensive, 47-year-old man who presented 1 month post-cadaveric KT with acute kidney injury and gram-negative bacteremia secondary to a large infectious anastomotic PA of the external iliac artery. RESULTS: Because of favorable anatomy, successful arterial angio-stent fixation of the main renal artery PA, sparing the lower polar artery, was performed after 1 week of antibiotic and fungal coverage. CONCLUSION: Patient was discharged after 2 weeks with functioning graft. Graft function was stable after 3 months.

Kidney Autotransplantation for Renal Artery Aneurysm: Case Series and a Systematic Review.

OBJECTIVES: Renal artery aneurysm (RAA) is a rare vascular disease. Kidney autotransplantation (KAT) is the treatment option when endovascular approach is not available. However, the evidence on KAT for RAA is mostly limited to small case series or reports. Here, we describe our 2 center experience of KAT for RAA, and provide the results of our systematic literature review to evaluate the outcomes. METHODS: A retrospective 2 center study was conducted in patients undergoing KAT for RAA between 2010 and 2018. Moreover, a systematic review was performed on medical databases to evaluate the outcomes of KAT for RAA. RESULTS: Nine patients were surgically treated at our institutions: eight with laparoscopic nephrectomy (LN), and 1 with open followed heterotopic KAT. All RAAs were ex-vivo reconstructed, and in 3 cases a vein graft was used for reconstruction. There were 2 postoperative major complications including 1 graft loss. In the systematic review, 102 studies with 355 patients were included. In 35 patients (9.9%) a minimal invasive approach was performed. The incidence of postoperative major complications and graft loss was 9.4% and 4.1%. CONCLUSIONS: Our experiences showed that laparoscopic approach for nephrectomy followed heterotopic KAT was feasible with good postoperative outcomes. KAT is an effective treatment for RAA when endovascular approach is not feasible for interpretation of the outcomes, the quality and sample size of the evidence should be taken into consideration.

Transplant Renal Artery Stenosis: A Case Report of Functional Recovery Six Months After Angioplasty.

Transplant renal artery stenosis (TRAS) is a common vascular complication after kidney transplantation, leading to worsening or refractory hypertension, deterioration in renal function, and possible cause of graft loss. Early diagnosis and an appropriate treatment are crucial for organ preservation. Endovascular treatment, including percutaneous transluminal angioplasty and stent implantation, is considered the first-line therapy for TRAS. Here we report the case of a 69-year-old woman with end-stage renal disease for chronic kidney disease not biopsy proven, who underwent a kidney transplant from expanded criteria donors on December 2018. Postoperative course was characterized by delayed graft function. Doppler ultrasonography (US) showed an increase of peak systolic velocity at the origin of the renal artery, and parvus-tardus waveform in periferic graft arteries and an abdominal computed tomography scan confirmed a stenosis at the origin of the main renal artery (TRAS). The patient underwent a percutaneous transluminal angioplasty. It was not possible to place a stent at the particular location of the stenosis at the anastomosis. Despite the improvement of the graft's perfusion, monitored with Doppler US, the patient showed a very poor improvement in renal function and remained on hemodialysis for months. A percutaneous needle biopsy reported a normal renal parenchyma and excluded acute rejection. During this period, the patient received immunosuppressive therapy. About 6 months after the transplant, the patient had an unexpected and slow renal function recovery until she was weaned completely from hemodialysis.

Predictive Model of Ureteral Obstruction of Allograft Kidney Following Living Donor Kidney Transplantation.

BACKGROUND: Ureteral obstruction is one of the most frequent urologic complications of kidney transplantation. This study aimed to analyze independent factors that contribute to ureteral obstruction following kidney transplantation and develop predictive models form those factors. METHODS: As many as 545 kidney transplantations were analyzed. Patients underwent transplantation between January 2014 and December 2018. Logistic regression analysis was used to develop the predictive model. Both donor and recipient demographic characteristics and operative parameters were analyzed and presented. RESULTS: There were 37 (6.8%) subjects who developed ureteral obstruction. The independent risk factors for ureteral obstruction were multiple allograft renal arteries, older donor ages (>38 years), and older recipient age (>60 years). From the receiver operating characteristic (ROC) curve analysis, the area under the ROC curve of the predictive model was 0.843 (P < .001). Subjects with >2 renal allograft arteries, recipient age >60 years, and donor age >38 years had 83.8% probability of developing ureteral stenosis after kidney transplantation. CONCLUSION: Donor age, recipient age, and multiple renal arteries were independent risk factors of graft ureteral obstruction. Probability of developing ureteral obstruction should be considered pre-operatively in our population, using the proposed predictive model.

Retrospective evaluation of the endovascular repair of the anastomotic pseudoaneurysm of the transplanted renal artery using the snorkel technique.

OBJECTIVE: To evaluate the endovascular repair of the transplanted renal artery anastomotic pseudoaneurysm using the snorkel technique. METHODS: From April 2012 to December 2017, we performed endovascular repair in six patients, who were diagnosed with transplanted renal artery anastomotic pseudoaneurysm, using the snorkel technique. The "snorkel" stent and the "parallel" stent were placed in the transplanted kidney and the external iliac artery, respectively. Another covered stent was implanted at the proximal end of the external iliac artery to match the diameter of the iliac artery.Result and conclusion: Of the six patients, three patients recovered. Two patients experienced pseudoaneurysm rupture due to infection, and one patient developed stent thrombosis; all three patients underwent graft nephrectomy. The endovascular treatment of transplanted renal artery anastomotic pseudoaneurysm with the snorkel technique is a feasible method but needs to comply with certain indications.

Outcomes of Small Renal Artery Targets in Patients Treated by Fenestrated-Branched Endovascular Aortic Repair.

OBJECTIVE: The aim was to evaluate renal related outcomes in patients who had incorporation of a small (<4.0 mm) renal artery (RA) during fenestrated-branched endovascular aortic repair (F-BEVAR). METHODS: A total of 215 consecutive patients enrolled in a prospective F-BEVAR trial were reviewed. Computed tomography angiography centreline of flow reconstruction was used to measure mean RA diameter. Patients who had at least one <4.0 mm main or accessory RA incorporated by fenestration or directional branch (study group) were compared with patients who had incorporation of two ≥5.0 mm RAs (control group). Endpoints were technical success of RA incorporation, RA rupture and kidney loss, primary and secondary RA patency, RA branch instability and re-interventions, and renal function deterioration. RESULTS: Twenty-four patients with 28 <4.0 mm RAs (16 accessory and 12 main RAs) were compared with 144 patients with 288 ≥5.0 mm incorporated RAs. Study group patients were significantly younger than controls (72 ± 8 vs. 75 ± 8 years, p = .04) and more often females (46% vs. 21%, p = .018); there were no differences in cardiovascular risk factors and aneurysm extent. Technical success was 92% for <4.0 mm and 99% for ≥5.0 mm RA incorporation (p = .05). Inadvertent RA rupture occurred in three patients in the study group (13%) and in one (1%) in the control group (p = .009) resulting in kidney loss in two study group patients (8%) and one (1%) control group patient (p = .05). At one year, primary patency was 79 ± 9% vs. 94 ± 1% (p < .001) and secondary patency was 84 ± 8% vs. 97 ± 1% (p < .001) for study vs. control group; freedom from branch instability was 79 ± 9% vs. 93 ± 2% (p = .005), respectively. There were no differences in re-intervention rates and renal function deterioration between the groups. The mean follow up time was 21 ± 14 months. CONCLUSION: Incorporation of <4.0 mm RAs during F-BEVAR is associated with lower technical success, higher risk of arterial disruption and kidney loss, and lower patency rates at one year.

Orthostatic Renal Transplant Compression Following Weight Gain Leading to Acute Kidney Injury.

BACKGROUND: We present a first case of orthostatic renal graft compression and acute kidney injury following weight gain. CASE REPORT: A 61-year-old male with a second cadaveric transplant presented with acute kidney injury - creatinine rise from 80 to 210 µmol/L (0.90 to 2.38 mg/dL). His medical history included diabetes, hypertension, ischemic heart disease, and obesity despite bariatric surgery. Renal biopsy was consistent with acute tubular necrosis. Serial renovascular duplex studies showed absence of diastolic flow and reduced renal perfusion despite a patent renal transplant artery and vein. Raising the fatty apron cephalad normalized renal blood flow with resistive indices throughout the kidney. Subsequent laparascopy ruled out adhesional obstruction and carbon dioxide angiogram confirmed normal transplant vessels, anastomotic sites, and intrarenal branches. He was treated with bedrest and an abdominal support belt with improvement of creatinine to 100 to 110 µmol/L (1.1-1.2 mg/dL). CONCLUSIONS: Transplant physicians and surgeons need to be aware of positional renal graft compression from an enlarged bulky omentum and fatty apron. Diagnosis requires positional sonography.

[Treatment of a complex renal artery aneurysm by renal autotransplantation]. / Traitement d'un anévrisme complexe de l'artère rénale par autotransplantation rénale.

Renal artery aneurysm (AAR) is rare and usually asymptomatic; rupture, thromboembolism are aneurysmal complications that can then lead to renal infarction. AAR is often found fortuitously when exploring other diseases. Renal autotransplantation (RAT) is an alternative treatment for complex AAR, with satisfactory outcomes described in the literature.

Laparoscopic procurement of single versus multiple artery kidney allografts: Meta-analysis of comparative studies.

Laparoscopic donor nephrectomy has become the standard procedure to procure kidney graft. Transplantation using multiple arteries allograft is technically more challenging and still controversial with respect to renal transplantation outcomes. The objective of this study was to examine the transplantation outcome in both donor and recipient outcome of multiple arteries allograft kidney compared with single renal artery kidney. Eligible studies were identified from electronic databases: PubMed, Cochrane CENTRAL, Science Direct, and CINAHL as of October 2016. Relevant parameters explored using Review Manager V5.2 included donor and recipient outcomes. Twenty-four studies were included in this meta-analysis. Compared with SA, MA kidneys were associated with a longer donor operative time. There was no difference between donor length of stay, intraoperative blood loss, hospital stay, first warm ischemic time (WIT-I), and donor surgical complications in donors with multiple arteries compared with single. There was an increased risk of one-year graft loss (OR 1.57, 95% CI 1.09 to 2.26, p = 0.016), recipient vascular complications and recipient ureteral complications in multiple arteries compared with single artery allografts. Kidney transplantation with multiple arteries is relatively as safe as single artery in terms of donor outcomes. However, transplantation with multiple arteries allograft had several potential negative impacts on the recipient outcomes.

Endovascular Treatment for a True Aneurysm of the Transplant Renal Artery using Noncovered Stent-Assisted Coil Embolization.

True degenerative aneurysms involving the donor renal artery after kidney transplantation are rather rare. The indications for operation and optimal therapy to combat this vascular complication are still not clear. Surgical revision has been used as a potential treatment: nonetheless, it has been associated with high risk of complications. In the present study, we report on a 31-year-old woman with a true aneurysm located at a transplant renal artery after transplantation which was successfully managed with stent-assisted coil embolization, resulting in occluded aneurysm sac and well-preserved renal function without any complication. We present technical details of this endovascular procedure, which may be useful for transplant renal artery aneurysm repair in high-risk surgical patients.

Ex Vivo Repair of a Renal Artery Saccular Aneurysm in a Living-Nonrelated Donor and Subsequent Successful Kidney Transplantation.

The use of kidney grafts with aneurysmal disease involving the renal arteries for transplantation is very uncommon and relatively controversial. We herein present the case of a 52-year-old woman who volunteered to become a living-nonrelated donor; during the preoperative imaging workup, a computed tomography angiography revealed a 1.5-cm saccular aneurysm in the left kidney, while the contralateral renal artery was normal. We decided to utilize the left kidney for a 25-year-old male patient with end-stage renal disease, and following the ex vivo repair using the recipient epigastric vessels and saphenous veins, we completed the transplantation in the right pelvic fossa. The postoperative period was uneventful, and at 8 months from the surgery, the graft remains functional. The surgical repair of renal artery aneurysms followed by immediate kidney transplantation is a safe technique and an effective replacement therapy for recipients. The incidental finding of isolated aneurysmal disease in renal arteries should not exclude graft potential availability for transplantation following repair.

Surgical Challenge in Pediatric Kidney Transplant Vascular Anastomosis.

During pediatric kidney transplant, surgical challenges occasionally occur. In particular, vascular anastomosis should be considered for children with small body weight < 12 kg, multiple renal arteries, vascular anomaly, and inferior vena cava occlusion. In pediatric patients, a living-donor renal graft is usually donated from a parent. Therefore, the renal artery and vein are too large to be anastomosed with the recipient's internal iliac artery and external iliac vein. In children who are > 12 kg, the renal artery and vein could be anastomosed with the external iliac artery and the external iliac vein. In children who are < 10 kg, the renal artery and vein should be anastomosed directly with the aorta and inferior vena cava. A pediatric transplant surgeon should consider arterial and venous anastomosis sites before transplant surgery. In small children with partial or total inferior vena cava occlusion, the venous anastomosis site should be evaluated. If the graft is placed on the left side, a venous graft must be used as a bridge between the renal vein and inferior vena cava. In 13 kidney transplants in children with inferior vena cava occlusion, 7 were on the left and 6 were on the right side. A patent segment of the inferior vena cava, the left original renal vein, an ascending lumbar vein, an azygos vein, the first graft renal vein, and a portal vein were used for venous anastomosis in 6, 2, 2, 1, 1 and 1 recipient, respectively. One child had graft loss due to renal vein thrombosis and one died of hemorrhage immediately posttransplant. Three had grafts with relatively long-term function, but these were lost due to chronic allograft nephropathy 100, 122, and 137 months posttransplant. However, the other 8 recipients have so far maintained graft function from 6 to 138 months since transplant.

Successful Implantation of a Renal Allograft With Quintuple Arteries Retrieved From a Living Donor.

In renal transplant, multiple renal arteries in a donor require meticulous vascular reconstruction for successful allograft function in the recipient. Presence of more than 4 renal arteries is usually considered to be a relative contraindication for proceeding with renal donation. We report a living-donor renal transplant procedure where preoperative radiologic imaging of the donor showed 3 left renal arteries. Two additional arteries were identified intraoperatively. All 5 arteries were reconstructed during the back-table procedure, and the allograft was implanted in the recipient. At 3-month follow-up, computed tomographic imaging demonstrated patency of all 5 renal arteries, and the patient had a serum creatinine level of 0.8 mg/dL. Unidentified arteries on preoperative imaging may occasionally require complex reconstruction. A renal allograft with 5 renal arteries is usually a contraindication for renal donation. Here, we describe the first published case of successful kidney transplant after reconstruction of 5 renal arteries in the donor graft.

Angiotomografía renal en el donante vivo y su correlación con la ablación quirúrgica / Computed tomography renal angiography of living donors and its correlation with surgery

Objetivos: Determinar la precisión de la angiotomografía renal (ATR) en la evaluación del sistema arterial y las variantes anatómicas en el donante vivo, con la correlación con su ablación quirúrgica. Materiales y métodos: Se evaluaron retrospectivamente los pacientes sometidos a nefrectomía laparoscópica como donantes vivos renales y sus ATR, entre 2014 y 2016 en nuestra Institución. Se utilizó análisis estadístico descriptivo para presentar los resultados. En la ATR se evaluaron: número de arterias renales principales, presencia y número de arterias polares y alteraciones del calibre de la arteria renal. Resultados: Se incluyeron 21 pacientes sometidos a nefrectomía laparoscópica como donantes vivos, 10 mujeres y 11 hombres (entre 23 y 61 años). En todos los casos se realizó la ablación del riñón izquierdo. De los 21 pacientes analizados, 15 no presentaron variantes anatómicas ni alteraciones del calibre en la ATR (una arteria renal principal, sin polares). Estos mismos hallazgos se certificaron en la ablación. En un caso, la ATR observó doble arteria renal principal con el mismo hallazgo quirúrgico; y en tres casos la ATR reconoció una única arteria polar, las cuales se corroboraron en la ablación. En estos 19 casos se demostró correlación entre la ATR y la ablación, con una precisión del 90,4% En los 2 casos restantes, hubo discrepancias. Conclusión: El conocimiento detallado del sistema arterial es necesario para la planificación quirúrgica de la nefrectomía laparoscópica del donante vivo renal. La angiotomografía renal constituye el método de elección para su evaluación, demostrando muy buena correlación entre sus hallazgos y los de la ablación.

Objective: To determine the accuracy of computed tomography renal angiography (CTRA) in the assessment and diagnosis of arterial vascular anatomy of the kidney and its variations in living kidney donors, with its correlation in harvesting kidneys. Materials and methods: Patients who had undergone laparoscopic nephrectomy as living kidney donors and their CTRA were retrospectively evaluated between 2014 and 2016 in our institution. Results are presented using statistical descriptive analysis. The following were assessed in the CTRA report: number of main renal arteries, presence and number of accessory polar arteries, and anomalies related to renal artery calibre. Results: Of the 21 patients that had undergone laparoscopic nephrectomy as living donors, there were 10 female and 11 male donors (age range 23 - 61 years). Renal harvesting included left kidney in all cases. In 15 cases, no anatomical variations or arterial renal dilations were found in computed tomography renal angiography (CTRA): (one main renal artery, without accessories arteries). The same findings were certified during the surgery. In one case CTRA showed a double renal artery, and the same finding occurred in the surgical harvesting; and three cases in which one single polar accessory artery was certified at surgery. An overall accuracy of 90.4% for CTRA was obtained in 19 cases. In the remaining 2 cases, a discrepancy was found. Conclusion: Detailed knowledge of the renal arterial anatomy is important for the preoperative evaluation of the laparoscopic nephrectomy in living renal donors. Computed tomography renal angiography (CTRA) is the technique of choice for these patients, as it demonstrates a high correlation between tomography findings and surgery harvesting.

Renovascular hypertension: results in adulthood of renal autotransplantation performed in children.

BACKGROUND: This study describes the long-term results of renal autotransplantation for renovascular hypertension performed in children who are now 21 years of age or older. METHODS: Sixteen children (4 boys, 12 girls) with a mean age of 11.2 years at the time of the procedure underwent ex-vivo surgery at the university hospital of Saint-Etienne between 1992 and 2008. Acetylsalicylic acid was used for antiplatelet therapy in the postoperative period, without routine anticoagulation. The mean follow-up period was 15 years. The clinical course of these patients was retrospectively reviewed in adulthood and the results analyzed. RESULTS: The children were treated with a mean of 2.37 drugs per patient, and the mean preoperative blood pressure of the entire patient population was 151/89 mmHg. Mean preoperative creatinine clearance was 80 ml/min/1.73 m2. There was no postoperative death. One patient experienced a thrombosis immediately after the surgery, leading to a redo surgery. In this patient diuresis was restarted, but without efficient concentration and filtration, ultimately leading the patient to have a renal transplant after 1 year. At the end of the follow-up period, eight of the 16 patients (50%) were cured and the others were improved. At the last follow-up the mean blood pressure was 127/70 mmHg, and the mean number of drugs per patient was 0.68. The mean creatinine clearance at last follow-up was 104.3 ml/min/1.73 m2. Three patients had secondary procedures, with two undergoing percutaneous angioplasty (at postoperative months 9 and 12, respectively) and one having an hepatorenal bypass at postoperative year 4. Primary patency was 12/16 (75%); primary assisted patency was 15/16 (94%); secondary patency was 16/16 (100%). CONCLUSION: This study shows that renal autotransplantation has good and stable long-term results and is an effective conservative strategy for treating renovascular hypertension in children, thus avoiding nephrectomy.

[Treatment of ureteral fistula and stricture following renal transplantation with Boari flap].

OBJECTIVE: To estimate the incidence rate of ureteral fistula and stricture after kidney transplantation, and to evaluate the effect of bladder flap (Boari flap) on ureteral complication of the transplanted kidney. 
 Methods: The clinical data and risk factors from 270 recipients of renal transplantation, who came from the Centre of Organ Transplantation, Xiangya Hospital, Central South University from January 2010 to January 2015, were retrospectively analyzed. The surgical management included Boari flap for ureteral reconstruction, neoureterocystostomy and endoscopic therapy with double-J (DJ) stent placement. Surgical proceeding and the effectiveness were evaluated.
 Results: The incidence rate of ureteral fistula following renal transplantation was 3.3%. The risk factors for ureteral fistula included elder donor age (P<0.05), delayed graft function (P<0.01), bladder spasm (P<0.05), and multiple renal arteries in allograft (P<0.01). Four cases were recovered after conservative treatment, and the other 5 cases were recovered after the treatment with Boari flap for ureteric reconstruction. The incidence rate of ureteral stricture was 4.4%. The risk factors for ureteral stricture included elder donor age (P<0.05), delayed graft function (P<0.05), cystospasm (P<0.05), ureteral fistula (P<0.01) and multiple renal arteries in allograft (P<0.01). Four cases underwent endoscopic therapy, 2 of them carried out percutaneous nephrostomy followed by antegrade DJ stent placement and the other 2 patients by retrograde DJ stent placement under ureteroscopy. Eight patients underwent surgery, 6 of them was treated by Boari flap for ureteral reconstruction and 2 patients were treated by neoureterocystostomy. All the patients recovered after surgical management.
 Conclusion: The ureteral complications after renal transplantation include ureteral fistula and stricture. Although the total incidence is low, the complications can result in adverse effects to the graft function and the life quality of the recipients. The risk factors for ureteral complication include elder donor age, delayed graft function, cystospasm, and multiple renal arteries in allograft. Ureteral fistula is the risk factor for ureteral fracture. Boari flap for ureterial reconstruction is an effective method in the treatment of the ureteral fistula and stricture.

Successful Elongation of a Short Graft Renal Artery by a Gonadal Vein.

OBJECTIVES: The objective of this presentation is to share our experiences with a successful reconstruction of a short graft renal artery using a gonadal vein, which occurred during a difficult laparoscopic donor nephrectomy. CASE REPORT: A 27-year-old man was referred to our clinic for a living-related renal transplant with a diagnosis of end-stage renal disease. The donor was with his mother. At last, a laparoscopic donor nephrectomy was planned. Massive intra-abdominal hemorrhage occurred during the dissection of renal artery. Urgent intervention was performed to maintain the patency of renal allograft and to stabilize the donor. Hemorrhage was brought under control. Donor nephrectomy was completed with a short remaining segment of renal artery. We decided to use the elongation of the graft renal artery using the gonadal vein of the same side was decided. End-to-end anastomosis was performed. After elongation of graft renal artery, anastomosis to internal iliac artery was performed. The trans-plant procedure was completed successfully. The kidney functioned immediately. Doppler ultrasound revealed that perfusion of the kidney was normal. The postoperative creatinine levels of recipient were in the normal ranges. Daily urine output was normal. There are not enough publications about elongation of graft renal artery using gonadal vein. CONCLUSIONS: Elongation of a short remaining graft renal artery by using gonadal vein seems to be a simple, safe, and reliable method. This technique provides an alternative approach for the reconstruction of short renal arteries in living-donor kidney transplants.

Acute thrombosis of a transplanted renal artery after gastric ulcer bleeding in a patient with a long-term well-functioning renal allograft: A case report and literature review.

BACKGROUND: Acute thrombosis of a transplanted renal artery is a serious vascular complication following renal allograft transplantation, which usually occurs within the first month after transplantation and often results in graft loss. It rarely occurs beyond the first month, except in a rejected kidney or in a kidney with high-grade transplant renal artery stenosis. RESULT: A 65-year-old male with a history of type 2 diabetes mellitus, hypertension, pulmonary tuberculosis, and end-stage renal disease was previously treated with hemodialysis (HD). He received a kidney transplant and had a well-functioning graft for 2 years. He presented to our emergency department with gastric ulcer bleeding and received treatment involving an endoscopic submucosal epinephrine injection, a proton pump inhibitor, and blood transfusions. Nine days later, he complained of sudden lower abdominal pain and had acute anuric kidney failure. Renal ultrasonography revealed an absence of blood flow to the allograft kidney. Renal artery angiogram demonstrated complete occlusion of the transplanted renal artery. After thrombectomy and percutaneous transluminal angioplasty (PTA) with stent placement, 60% stenosis of the proximal renal artery with distal perfusion was noted. However, his graft function did not improve, and he received HD again. Histopathology of the transplanted kidney revealed ischemic tubular nephropathy with focal infarction without rejection. CONCLUSION: This is the first case of acute thrombosis of the transplanted renal artery following gastric ulcer bleeding in a patient with a long-term well-functioning graft kidney.