An uncommon encounter: crossed fused renal ectopia with singular ureter: a case report.

BACKGROUND: Crossed fused renal ectopia (CFRE) is a common congenital anomaly where one kidney is positioned abnormally on the opposite side of the midline, often fused with the other kidney. However, single ureter draining crossed fused renal ectopia is a rare occurrence. CASE REPORT: Here, we report a case of crossed fused renal ectopia with a single ureter in a 46-year-old Nepali male who presented with history of lithuria. Computed tomography revealed that the left kidney was situated on the right side and fused with the right kidney. The renal pelvises of both kidneys were fused, and a single ureter, located on the right side, was draining both kidneys into the bladder. The patient was advised to have regular follow-ups. CONCLUSION: Crossed fused renal ectopia with a single ureter represents a rare renal anomaly. Asymptomatic patients can typically be managed conservatively. Regular follow-up is recommended to monitor renal function, calculus formation, infections, and malignant changes.

Horseshoe kidney with teratoid type of Wilms tumor: a rare case report.

BACKGROUND: Horseshoe kidney is the most common renal fusion anomaly, and Wilms tumor is the most frequent renal malignancy in children. The occurrence of Wilms tumor in association with horseshoe kidney is a scarce anomaly. However, the arising of a teratoid type, which is a rare variant of Wilms tumor in a horseshoe kidney, is exceptionally unique. CASE PRESENTATION: This report presents a 5-year-old male admitted with horseshoe kidney involved by a large heterogeneous calcified mass that was diagnose on biopsy as Wilms tumor blastemal dominant. According to the local and regional extension and metastatic tumor in the lungs, the patient underwent neoadjuvant chemotherapy and then surgery. Post-operative pathologic findings confirmed the diagnosis of teratoid Wilms tumor. CONCLUSIONS: The occurrence of renal anomalies associated with a malignancy might be more frequent in the clinical environment. There are numerous differential diagnoses for renal tumors and masses, but the possibility of exceptional anomalies should not be denied, and clinicians should be prepared for these occasions. Although studies propose that chemotherapy has a trivial effect on teratoid Wilms tumors, it is essential to evaluate the tumor for any possibility of regression in non-teratoid regions before proceeding to upfront tumoral resection.

Robot-assisted Partial Nephrectomy With Selective Artery Clamping for Renal Cell Carcinoma in Horseshoe Kidney.

BACKGROUND: Robot-assisted partial nephrectomy (RAPN) has become the standard treatment for small renal tumors, including highly complex cases. However, applying RAPN to renal tumors in the horseshoe kidney (HSK) is clinically challenging due to malformations and complex blood supply. Herein, we present two cases of RAPN in patients with HSK treated using selective artery clamping methods. CASE REPORTS: A 61-year-old male with a 15 mm renal tumor located on the upper pole of the right HSK was referred to our Department. The patient underwent RAPN via the transperitoneal approach, following a three-dimensional computed tomography (3D-CT) assessment. Additionally, before surgery, we confirmed which renal arteries would be clamped in surgery by examining the kidney regions supplied by each renal artery. The second patient referred to our Department, a 45-year-old male, had a 46 mm renal tumor located on the isthmus of the HSK. His tumor received blood supply from two renal arteries, with the bilateral collecting systems converging and forming a ureter on 3D-CT. The patient underwent RAPN through an intraperitoneal approach in the semi-lateral position, with port placement lower than in standard RAPN. Pathological examinations revealed clear-cell renal cell carcinoma with negative surgical margins in both cases. Both patients had no recurrences or metastases at 53 and 13 months post-surgery, respectively. CONCLUSION: We present cases successfully treated with RAPN with selective artery clamping methods for HSK using 3D-CT without encountering complications, even in isthmus tumors.

Anterograde Aortic Bypass Technique for Renal Preservation in Aneurysmal Repair With Horseshoe Kidney: A Novel Approach With Reduced Renal Ischemic Time.

The purpose of this article is to highlight an innovative technique in the surgical management of aortic aneurysms in the presence of a horseshoe kidney. The technique involves an anterograde aortic bypass from the distal thoracic aorta to the major renal artery with the primary advantage to a significant reduction in renal ischemia time.

Pancake kidney and jejunal atresia: An uncommon dual anomaly detected prenatally-A case report.

Pancake kidney is a renal fusion anomaly with only a few reported prenatal diagnoses. Other structural anomalies beyond the urogenital system may also be associated. This study describes a dual anomaly case detected prenatally, comprising of pancake kidney and jejunal atresia. A postnatal abdominal ultrasound confirmed both kidneys were fused in the midline at the aortic bifurcation level, along with a type 3b jejunal atresia. Based on the available limited evidence about pancake kidney, renal functions appear to remain largely preserved and unaffected as in our case according to 6 months of follow-up. However, further investigation is needed to explore any potential association with chromosomal and structural abnormalities in selected cases.

Robot-assisted laparoscopic surgery for rectal cancer in a patient with a horseshoe kidney: A case report.

A 52-year-old, Japanese man presented to the hospital with a complaint of anal bleeding, and detailed examination resulted in a diagnosis of locally advanced rectal cancer. The patient underwent total neoadjuvant therapy followed by short-course radiation therapy and consolidation chemotherapy, which provided a partial response. After preoperative contrast-enhanced computed tomography showed a horseshoe kidney, robot-assisted, precise, laparoscopic, low anterior resection with D3 dissection and ileostomy construction was performed. The horseshoe renal isthmus was elevated surrounding the inferior mesenteric artery, and the left ureter and seminal vessels ran in front of the kidney. The hypogastric nerve traveled ventral to the horseshoe kidney. With robotic surgery, it was possible to perform more precise surgery while recognizing vascular and nerve anatomy in a rectal cancer patient with a horseshoe kidney due to good three-dimensional visibility and articulated forceps manipulation.

Laparoscopic retroperitoneal heminephrectomy for renal cell carcinoma in horseshoe kidney: a case report and review of the literature.

INTRODUCTION: In this case report, we demonstrate our technique of a retroperitoneal laparoscopic heminephrectomy for a T1b right hilar tumor in a horseshoe kidney. CASE PRESENTATION: A 77-year-old Vietnamese woman presented to the hospital because of right flank pain. On presentation, her serum creatinine was 0.86 mg/dL and glomerular filtration rate was 65.2 mL/minute/1.73 m2. According to her renal scintigraphy, glomerular filtration rates of the right and left moieties were 24.2 and 35.5 mL/minute, respectively. Computed tomography imaging demonstrated a 5.5 × 5.0 cm solid hilar mass with a cT1bN0M0 tumor stage was in the right moiety. After discussion, the patient elected a minimally invasive surgery to treat her malignancy. The patient was placed in a flank position. We used Gaur's balloon technique to create the retroperitoneal working space, and four trocar ports were planned for operation. Three arteries were dissected, including two arteries feeding the right moiety, one artery feeding the isthmus, and one vein, which was clipped and divided by Hem-o-lok. The isthmusectomy was performed with an Endostapler. Consequently, the ureter was clipped and divided. Finally, the whole right segment of the horseshoe kidney was mobilized and taken out via the flank incision. RESULTS: The total operative time was 250 min with an estimated blood loss of 200 mL. The patient's serum creatinine after surgery was 1.08 mg/dL, and glomerular filtration rate was 49.47 mL/minute/1.73 m2. The patient was discharged on postoperative day #4 without complication. Final pathologic examination of the tumor specimen revealed a Fuhrman grade II clear cell renal cell carcinoma, capsular invasion, with negative surgical margins. After a three-month follow-up, the serum creatinine was 0.95 mg/dL, and glomerular filtration rate was 57.7 mL/minute/1.73 m2. Local recurrence or metastasis was not detected by follow-up computed tomography imaging. CONCLUSIONS: Retroperitoneal laparoscopic heminephrectomy is a safe and feasible technique for patients with renal cell carcinoma in a horseshoe kidney and may be particularly useful in low income settings without access to robotic technology.

Imaging features of renal ectopia and fusion in 13 cats.

CASE SERIES SUMMARY: A retrospective multicenter case series of renal fusion anomalies in cats was investigated. The aim of this study was to describe the imaging characteristics (radiography, ultrasonography and CT) of renal ectopia and fusion in cats. A total of 13 feline patients (median age 9 years) were included in this multicentric retrospective study. Ultrasound was available in 12/13 cases, radiographs in 4/13 cases and CT in 3/13 cases. Of the 13 cases, seven were left to right fusions, four were right to left fusions, one was on the midline and one was in the pelvic inlet. Adopting a human classification system, there were five lump kidneys, four disc kidneys, one horseshoe kidney, one caudal ectopia, one L-shaped kidney and one pelvic kidney. In 2/13 cases, additional congenital malformations were noted, including an azygous continuation of the caudal vena cava and a peritoneal-pericardial diaphragmatic hernia. RELEVANCE AND NOVEL INFORMATION: This study provides further description of the imaging findings in feline patients with fused renal ectopia. The morphologic characteristics of the fused kidneys in cats appear similar to what is published in the human literature. Renal fusion might be an incidental finding in cats, but further investigations are necessary to determine their clinical relevance.

Bilateral Wilms tumor in a patient with a horseshoe and duplex kidney: A case report.

The occurrence of horseshoe kidney with duplex urinary collecting systems is rare. Herein, we report a case of bilateral Wilms tumor (BWT) in a patient with a concurrent horseshoe kidney and left duplex kidney, which had not been previously reported. The patient was treated with neoadjuvant chemotherapy, followed by surgical resection and adjuvant chemotherapy. The tumor recurred 6 months postoperatively. A second resection was performed, followed by the administration of chemotherapy and radiotherapy. The patient passed away 15 months after the initial diagnosis of BWT.

Horseshoe Kidney: 500 Years From the First Report in the Literature.

Horseshoe kidney or ren arcuatus is the most common renal fusion anomaly, with an incidence of 1:500 in the normal population and a male predominance of 2:1. In >90% of cases, the fusion occurs along the inferior pole. It may vary in location, orientation, and arterial and venous anatomy. In 1522, Berengario da Carpi described this renal malformation for the first time in his masterpiece "Isagogae breves" (Introduction to Anatomy). He reported the results of a postmortem examination in the public autopsy room of the University of Bologna, describing "kidneys that are continuous as if they were a kidney, with two emulsifying veins, two emulsifying arteries, two ureteral outlets." In 1564, Leonardo Botallo described and illustrated the features of this atypical anatomical representation, and later, in 1602, Leonard Doldius added further details by examining this anatomical feature during an autopsy. In 1761, Giovanni Battista Morgagni discussed this condition not only as a rare anatomical curiosity found only in necroscopy but also discussed its physiological aspect. In the nineteenth century, with the advent of renal surgery, the horseshoe kidney played a more important role in urological diagnosis and treatment, and its identification became more frequent. With the advent of pyelography, imaging reports of the horseshoe kidney allowed a more accurate representation of the anatomical variants, which was particularly useful in preoperative assessment and outcomes. Berengario da Carpi laid the foundation for a better knowledge of this anatomical anomaly. Five hundred years after the first report in the literature, relevant advances have been made in the management of complications associated with horseshoe kidney and in diagnosis, confirming the need to monitor individuals with this condition who are at higher risk of developing chronic kidney disease.

Retrograde intrarenal surgery for stones associated with renal anomalies: caliceal diverticulum, horseshoe kidney, medullary sponge kidney, megacalycosis, pelvic kidney, uretero-pelvic junction obstruction.

PURPOSE OF REVIEW: Nowadays, due to the increase of imaging diagnosis, we identify easily renal anomalies, and we can choose between a wide range of armamentarium to treat symptomatic stones in those challenging cases. However, there is a lack of evidence and consensus on its use. The aim of this narrative review is to collect all the available data about safety and efficacity of retrograde intrarenal surgery (RIRS) in the treatment of kidney stones associated to a renal anomaly. RECENT FINDINGS: Renal anomalies are uncommon findings and even more if it has to be associated with renal stones. After a literature review of the past 2 years, there are a small number of studies that compare the outcomes in patients who have been treated with minimally invasive modalities and they are mainly focus on RIRS. SUMMARY: It is of extreme importance to know the advances on the stone treatment in anomalous kidneys. With the development of new laser technologies, RIRS is becoming a more interesting technique with high success rate and safety. Further studies are needed to make an accurate statement about the adequate surgical technique for each renal anomaly and also, clinical trials using new laser technologies.

Is there a correlation between urolithiasis in horseshoe kidneys and isthmus thickness or renal angulation?

BACKGROUND: Stone disease is a common complication of horseshoe kidneys (HSK). There are currently limited studies that examine the relationship between HSK anatomy and stone formation. We aim to determine if there is such an association by measuring the isthmus size and renal angulation in both stone and non-stone forming HSK using computed tomography (CT). METHOD: This is a retrospective study performed at a single tertiary centre. Using the radiological information system, all CT reports between 01 January 2010 and 31 December 2015 were searched for the keyword 'horseshoe' on the radiological information system. This produced a list of 285 reports. Each report and image packet of these 285 studies were reviewed to confirm the presence of an HSK and duplicate patients from multiple examinations were highlighted. One hundred and thirty-eight unique HSK patients were obtained and the studies were assessed for the presence or absence of stones. A total of 112 HSK were found; 88 of which contained no stone and 24 with stone. Angle measurements and isthmus size were measured on these kidneys. As axial images are obtained as standard in all cases, these measurements were all obtained in the axial plane. All parameters were measured and recorded manually by one person so as to reduce inter-observer variability. RESULTS: Isthmus size varied widely, measuring from 2 to 39 mm. Right renal angle ranged from 51 to 158°, left 38 to 152°. CONCLUSION: The isthmus size and renal angle measurements were not found to be significant determinants for stone disease in our patient population.

Venous supply of horseshoe kidneys and normal kidneys: an angio-multislice computed tomography-based study.

BACKGROUND: Horseshoe kidney (HSK) is a common developmental anomaly which can be associated with many atypical anatomical variants of blood supply. The aim of this study was to identify the anatomical variants of renal veins supplying HSK, with particular emphasis on their relationship with the arterial system. MATERIALS AND METHODS: The analysis included 94 patients with HSK and 248 persons with normal kidneys (NK). Based on computed tomography-angiography, the number of renal arteries and veins was determined, along with the levels the arteries branched off the aorta and the veins communicated to their parental vessels. RESULTS: Four hundred and twenty-three renal arteries (4.5 per person) and 364 renal veins (3.78 per persons) were found in HSK group (p = 0.004), as compared with 598 arteries (2.41 per person) and 567 veins (2.29 per person) in the NK group (p = 0.025). Mean number of renal veins in women with HSK was higher than in men (4.11 vs. 3.72 per patient, p = 0.03). In the HSK group, the number of renal arteries correlated significantly with the number of renal veins only among men (ks = 0.35, p = 0.009). In patients with NK, significant correlations between the number of renal arteries and renal veins were found both in the whole group and among men and women. CONCLUSIONS: Horseshoe kidneys are drained by a higher number of renal veins than NK, especially in women; this also refers to accessory renal veins. The number of renal veins for HSK is less dependent on the number of corresponding arteries than these for NK.

[LAPAROSCOPIC LIVE DONOR NEPHRECTOMY WITH HORSESHOE KIDNEY: A CASE REPORT].

We performed laparoscopic live donor nephrectomy (LDN) on approximately 200 patients in Ehime Prefectural Center Hospital between 2003 and 2016. In 2016, a fifty-something woman who was a donor candidate for her husband was revealed to have a horseshoe kidney through contrast-enhanced computed tomography; other LDN procedures used a retroperitoneal approach, but this one used a transperitoneal approach since the latter approach allowed for a more favorable visual field. The left kidney was selected since renal scintigraphy showed equal bilateral renal function and renal arteries are simpler on the left side. The kidney was removed after the isthmus was successfully transected without ischemia. The opened calyx in the left kidney was sutured via bench surgery, and the kidney was transplanted to the recipient. Postoperative courses of both donor and recipient were good.

Posición óptima para la nefrolitotomía percutánea en el riñón en herradura: ¿prono tradicional o supino? / Optimal patient position for percutaneous nephrolithotomy in horseshoe kidneys: Traditional prone or supine?

Objetivo: Aunque se ha afirmado que la nefrolitotomía percutánea (NLPC) en posición supina se asocia a tiempos quirúrgicos relativamente más cortos y a tasas de éxito y complicaciones comparables, no hay consenso en la literatura actual sobre la seguridad y la eficacia de la NLPC en posición supina en pacientes con riñón en herradura. Nuestro objetivo es comparar la NLPC en posición supina y en posición prona, en términos de seguridad y eficacia en pacientes con riñón en herradura.Métodos: Se revisaron retrospectivamente los datos de los pacientes con riñón en herradura sometidos a una NLPC por cálculos renales de más de 2cm entre enero de 2010 y mayo de 2021. Los pacientes del estudio se clasificaron como Grupo1 (NLPC en supino [SNLPC]) y Grupo2 (NLPC en prono [PNLPC]). Se compararon los datos demográficos, clínicos y quirúrgicos de los dos grupos.Resultados: Se incluyeron 65 pacientes, de los cuales 31 (47,7%) pertenecían al Grupo1 y 34 (52,3%) al Grupo2. Los datos demográficos, las características de los cálculos, los parámetros perioperatorios y las tasas de complicaciones fueron estadísticamente similares entre los dos grupos (p>0,05). No hubo diferencias estadísticas en cuanto a las tasas de tratamiento adicional y las tasas de ausencia de cálculos en los controles postoperatorios del segundo día y del tercer mes (p>0,05). El tiempo quirúrgico medio fue significativamente mayor en el Grupo2 (113±17,1minutos) que en el Grupo1 (90,6±11,3minutos) (p=0,000).Conclusión: Aunque tradicionalmente se realiza en posición prona, el abordaje en posición supina es similar en términos de seguridad y de eficacia. Además, la posición supina se asocia con tiempos quirúrgicos significativamente más cortos (AU)

Objective: Although it was stated that supine percutaneous nephrolithotomy (PCNL) was associated with relatively shorter surgical times and comparable success and complication rates, there is no consensus in the current literature concerning the safety and efficacy of supine PCNL in patients with horseshoe kidneys. We aimed to compare supine and prone PCNL regarding safety and efficacy in patients with horseshoe kidneys.Methods: Data of the patients with horseshoe kidneys who underwent PCNL for renal stones larger than 2cm between January 2010 and May 2021 were retrospectively reviewed. The study patients were categorized as Group1 (i.e., supine PCNL-SPCNL) and Group2 (i.e., prone PCNL-PPCNL). Both groups were compared regarding demographic, clinical, and surgical data.Results: Sixty-five patients were included. Among these patients, 31 (47.7%) were in Group1, while 34 (52.3%) were in Group2. Both groups were statistically similar in terms of demographic data, stone characteristics, perioperative parameters, and complication rates (P>.05). There was no statistical difference in terms of additional treatment rates, stone-free rates in the postoperative second-day and third-month evaluations (P>.05). Mean surgical time was significantly longer in Group2 (113±17.1minutes) than in Group1 (90.6±11.3minutes) (P=.000).Conclusion: Although it is traditionally performed in the prone position, the supine approach is as safe and effective as the prone approach. In addition, the supine approach is associated with significantly shorter surgical times (AU)