Síndrome de cascanueces y agenesia renal derecha. Una rara asociación

Introducción: El síndrome de cascanueces se considera una anomalía infrecuente y poco pensada en la práctica médica; su incidencia no está bien establecida debido a su sintomatología variada. La agenesia renal unilateral se estima entre 1/2500 y 1/4000 nacidos vivos. Objetivos: Describir una paciente de 18 años con sospecha prenatal de agenesia renal derecha confirmada por imágenes después del nacimiento, que ingresó por proteinuria. Presentación del caso: Paciente de 18 años con agenesia renal derecha conocida, en la que un examen de orina detectó proteinuria desde los 13 años. En su estudio se clasificó como proteinuria ortostática y evolutivamente refirió dolor lumbar izquierdo ligero y transitorio. En el ultrasonido renal, realizado para valorar crecimiento del riñón único, se detectó dilatación de la vena renal izquierda. Se repitió el estudio ecográfico para precisar ángulo aorto-mesentérico y dilatación de vena renal izquierda, y se confirmó el síndrome de cascanueces. Conclusiones: La asociación entre agenesia renal derecha y síndrome de cascanueces, resulta extremadamente rara, y, cuando se presenta con proteinuria ortostática y dolor lumbar ocasional, debe seguirse en forma expectante, pero no se necesita tratamiento quirúrgico en la mayoría de los casos.

Introduction: Nutcracker syndrome is considered an infrequent and poorly thought out anomaly in medical practice; its incidence is not well established due to its varied symptomatology. Unilateral renal agenesis is estimated to be between 1/2500 and 1/4000 live births. Objectives: To describe an 18-year-old female patient with suspected pre-natal imaging-confirmed right renal agenesis after birth, who was admitted due to proteinuria. Case presentation: An 18-year-old female patient with known right renal agenesis, in whom a urine test detected proteinuria from the age of 13. In the study it was classified as orthostatic proteinuria and evolutionarily she referred mild and transient left low back pain. Renal ultrasound, performed to assess single kidney growth, showed dilation of the left renal vein. The ultrasound study was repeated to specify aorto-mesenteric angle and left renal vein dilation, and nutcracker syndrome was confirmed. Conclusions: The association between right renal agenesis and nutcracker syndrome is extremely rare, and, when it presents with orthostatic proteinuria and occasional low back pain, it should be followed expectantly, but surgical treatment is not needed in most cases.

Cystic fibrosis transmembrane conductance regulator (CFTR) gene abnormalities in Indian males with congenital bilateral absence of vas deferens & renal anomalies.

Background & objectives: The role of cystic fibrosis transmembrane conductance regulator (CFTR) gene mutations in congenital bilateral absence of vas deferens and unilateral renal agenesis (CBAVD-URA) has been controversial. Here, we report the cases of five Indian males with CBAVD-URA. The objective was to evaluate the presence or absence of CFTR gene mutations and variants in CBAVD-URA. The female partners of these males were also screened for cystic fibrosis (CF) carrier status. Methods: Direct DNA sequencing of CFTR gene was carried out in five Indian infertile males having CBAVD-URA. Female partners (n=5) and healthy controls (n=32) were also screened. Results: Three potential regulatory CFTR gene variants (c.1540A>G, c.2694T>G and c.4521G>A) were detected along with IVS8-5T mutation in three infertile males with CBAVD-URA. Five novel CFTR gene variants (c.621+91A>G, c.2752+106A>T, c.2751+85_88delTA, c.3120+529InsC and c.4375-69C>T), four potential regulatory CFTR gene variants (M470V, T854T, P1290P, Q1463Q) and seven previously reported CFTR gene variants (c.196+12T>C, c.875+40A>G, c.3041-71G>C, c.3271+42A>T, c.3272-93T>C, c.3500-140A>C and c.3601-65C>A) were detected in infertile men having CBAVD and renal anomalies Interpretation & conclusions: Based on our findings, we speculate that CBAVD-URA may also be attributed to CFTR gene mutations and can be considered as CFTR-related disorder (CFTR-RD). The CFTR gene mutation screening may be offered to CBAVD-URA men and their female partners undergoing ICSI. Further studies need to be done in a large sample to confirm the findings.

Unilateral renal agenesis: case review of ambulatory pediatric nephrology clinics in Cali / Agenesia renal unilateral: revisión de casos de la consulta nefrológia pediátrica en centros asistenciales de Cali

Introduction: Unilateral renal agenesis is a frequent renal malformation with incidence of 1 per 1000 live born children. There are no statistics nor protocols to manage and follow-up these patients. Usually asymptomatic, it can be early detected by prenatal ultrasound, allowing opportune detection and adequate follow up. The goal is to describe main features found in children with renal agenesis at four ambulatory pediatric nephrology clinics in Cali, Colombia: Hospital Universitario del Valle (HUV), Club Noel Children’s hospital and the private practice of two pediatric nephrologists. Methods: This is a retrospective descriptive study in a series of cases with congenital renal agenesis diagnosed between January, 1995 and December 2007, of patients under 18 years of age and based on a review of clinical records. Results: 43 patients were found, 51.2% males, 88% from the department of Valle del Cauca. Prenatal diagnoses were conducted in only 21% of these patients; agenesis was right in 48.8% and left in 51.2%. In 46.5%, association with other pathologies was found: occult spinal bifida, congenital scoliosis, and Klippel-Feil sequence. Compensatory renal hypertrophy was reported in 39.5% of the patients, 42% had episodes of urinary tract infection, 31% vesicoureteral reflux and 10% proteinuria. Four male patients (9.3%) developed renal failure. The average follow-up was 6.6 years. Conclusions: Prenatal diagnose was not very frequent in our set of cases. Urinary tract infection and vesicoureteral reflux were common, increasing the risk of renal deterioration. Prolonged follow up is suggested, with unified protocols to prevent renal failure.

Introducción: La agenesia renal unilateral (ARU) es una malformación con una incidencia de 1 por 1000 nacidos vivos. En Colombia no hay estadísticas ni protocolos para el manejo y seguimiento de estos pacientes. La ARU casi siempre es asintomática y se puede descubrir temprano por ecografía prenatal, que permite el adecuado seguimiento. El objetivo es describir las características principales encontradas en la revisión de historias clínicas de niños con agenesia renal que se examinaron en dos servicios de  nefrología pediátrica de la ciudad de Cali: Hospital Universitario del Valle (HUV), Hospital Infantil Club Noel (HICN) y en los consultorios de dos nefrólogas pediatras.Metodología: Es un estudio descriptivo retrospectivo de tipo serie de casos basado en la revisión  de historias clínicas, de pacientes menores de 18 años con diagnóstico de agenesia renal congénita atendidos entre enero de 1995 y diciembre de 2007. Resultados: Se encontraron 43 pacientes, 51.2% masculinos. El 88% procedía del departamento del Valle. El diagnóstico prenatal sólo se hizo en 21% de los casos.  En 48.8% de los pacientes la agenesia renal fue derecha y en el resto izquierda. En 46.5% hubo asociación con otras entidades (espina bífida oculta, escoliosis congénita y secuencia de Klippel Feil). En 39.5% de los pacientes se vio hipertrofia renal compensatoria, 42% presentaron algún episodio de infección urinaria, 31% reflujo vésico-ureteral y 10% proteinuria; en 4 pacientes (9.3%), todos varones desarrollaron falla renal. El promedio de seguimiento fue 6.6 años. Conclusiones: El diagnóstico prenatal fue poco frecuente en esta serie de casos. La infección urinaria y el reflujo vésico-ureteral son altos y aumentan el riesgo de daños renales. Se recomienda el seguimiento extendido en niños con ARU, mediante protocolos unificados para prevenir el deterioro renal.

2 Cases of Unilateral Renal Agenesis / 대한비뇨기과학회지

Renal agenesis is a relatively rare congenital anomaly. The frequent difficulty in establishing a definite diagnosis of renal agenesis is emphasized. Recently we experienced 2 cases of renal agenesis in 24-year-old male patients, so we report these 2 cases of renal agenesis with review of literatures.