Congenital Urinary Tract Anomalies: About Cases 80 Cases at the University Hospital of Brazzaville

Objective: To determine the diagnostic and therapeutic aspects of urinary tract anomalies in children in our environment. Patients and methods: This was a retrospective descriptive study conducted in the pediatric surgery and urology-andrology departments of the University Hospital of Brazzaville, from January 2012 to December 2017. Children aged 0 to 17 years old hospi-talized for a malformation of the urinary tract were included. Results: The frequency of urinary tract anomalies was 1% of all patients admitted during the study period. The average age of the patients was 6.1 years (range, 0 - 17 years). The most common motive of consultation was ectopic urethral meatus (66.2%), vesical urine retention (18.7%) and lumbar spine pain (6.3%). Hypospadias was more common with 58.7%, followed by posterior urethral valves (20%), uretero-pelvic junction obstruction (7.5%). The most frequent preoperative complications were urinary tract infection (11.3%), urolithiasis (3.7%) and renal failure (2.5%). The treatment was surgical including urethroplasty (70.1%), or instrumental based on destruction of valves (16.9%). Conclusion: Urinary tract anomalies suffer late diagnosis and treatment in our practice. An antenatal screening strategy should be put in place to im-prove care to prevent the occurrence of complications.

structures, external or internal, isolated or multiple, fixed or progressive, due to a disorder of embryogenesis [1], interesting both the kidneys and excretory ways. They occupy the 3rd rank of overall congenital anomalies with 10% of cases [2] and affect about 3% to 4% of the population [1]. The nature of anomalies is variable and their severity is different, ranging from complex anomaly to a simple anomaly of position or conformation [3]. While in Europe, malformative uropathies are diagnosed during antenatal examination [4] [5]; however in Africa, they are still diagnosed after birth, most often following a complication [6], the most feared being renal failure. In Congo, very few studies have been carried out on these pathologies [7] [8]; the objective of this study was the diagnostic and therapeutic aspects of UTA in children in our hospital practice environment.

Patients and Methods
This was a retrospective study that took place in the departments of Pediatric Surgery and Urology-Andrology of the University Hospital of Brazzaville from January 2012 to December 2017 (6 years). During the study period, we included all children from 0 to 17 years hospitalised for malformative uropathy operated or not, and having an exploitable medical data. The data collected on a survey form, from medical records and registers of admissions and operative procedure reporting. We studied the variables: -epidemiological: frequency, sex, age; -diagnostics: • Clinical: motive of consultation, physical examination, discharge diagnosis, as well as the associated congenital anomalies.
• Paraclinical: renal and urinary tract ultrasonography, retrograde urethrocystography (RUC), intravenous urography (IVU) to determine the type of malformative uropathy and its repercussions; as well as serum creatinine and uroculture for complications.
Analysis of data was done using the Epi Info software. Quantitative variables were expressed in terms of means ± standard deviation and qualitative variables as percentage form. For the statistical analysis, we used the Pearson correlation test (chi-square) with a significance threshold p < 0.005.

Epidemiological Aspects
During the study period, 8113 patients were admitted to the pediatric surgery and urology-andrology departments, including 80 UTA cases (1%). The average
Ultrasound of the urinary tract (Table 1)

Diagnoses
The discharge diagnoses are shown in Table 2.
Hypospadias was the most common disease with 47 cases (58.7%) and the average age at the time of diagnosis was 5.6 years old (0 -17 years old).

Therapeutic Aspects
Seventy-seven (96.2%) patients were treated including two patients with renal cystic dysplasia who were monitored and one patient died before surgery. Surgical treatment was performed in 62 cases (81.2%) depending on the disease; and 15 (17.5%) patients had instrumental treatment by destruction of the posterior urethral valves either by laminating or with Beniqué probe. The different types of surgeries performed are shown in Table 3.

Evolutionary Aspects
The mean length of hospitalization was 13.7 days ± 8.6 days (3 to 45 days).

Discussion
As with any retrospective, descriptive and monocentric hospital study, we were limited in the collection of some data on the one hand and the results obtained cannot be extrapolated in general.

Epidemiological Aspects
In our study, UTA represent 1% of all admissions to the service. This frequency is lower than those observed in Conakry [9] with 4%. For Kahloul et al. [10], this rate is 3%, in a study conducted in a pediatric ward where admissions are higher than ours. Most authors agree that uropathies are frequent in boys like observed in our study [9] [10] [11]; it cans be explained by the high frequency of malformations of the male urethra, especially hypospadias and epispadias.
The average age of children in our study is 6.1 years old (0 to 17 years old) at the time of diagnosis. This result is close to that reported by Asinobi et al. [6] in Nigeria while in western countries postnatal discovery is earlier, particularly with an average age of 11 months in Germany [12], 10.6 months in Poland [13].

Diagnostics Aspects
Circumstances of discovery the occurrence of urine infection which that is the age remains a mode of revelation very frequent. For Solomon [15], congenital abnormalities of the urinary tract are the leading cause of chronic renal failure in children.

Hypospadias
Hypospadias is one of the most common congenital anomalies of the urethral spongiosum, the ventral prepuce and in more severe cases penile chordee. It is the most common urinary tract anomaly in our series with a mean age at the and two stage alternative techniques [21]. Fistula is the most common complication after urethroplasty [22]; in our study, we noted 42.5% of fistula after uretrhoplasty.
Posterior urethral valves During our study, we found 16 cases in 10 years, with a hospital frequency of 1.6 cases/years. They constitute the second cause of UTA with 20% of cases. The incidence of posterior urethral valves is variously reported in the literature ranging from 1 to 4/1000 births [22] [23]. Urinary disorders such as dysuria or urine retention are constant [22] [23]. Ante-natal ultrasound allows the early management of this disease from birth [6]. Fogarty probe [24] is still the most commonly used technique in our hospital practice, although currently the standard treatment of the posterior urethral valves is endoscopic resection as soon as possible to avoid the occurrence complications [25] [26].
Pyelo-ureteral junction syndrome In our series, it represents 7.6% of UTA; this rate is variable according to some authors, more important in developed countries especially in England with 38% [27] and lower in developing countries with 14% in Tunisia [10] and 3.2% in Mali [28]. This difference can be explained by the absence or insufficiency of antenatal diagnosis and by low health coverage in our countries where the diagnosis is generally suspected during abdominal mass or complications including urinary infections. [10] [28]. In our series, treatment consisted of conventional pyeloplasty using the Anderson-Hynes technique [29] in 2 patients and the 3rd had a total nephrectomy due to destruction of the renal parenchyma.
Bladder exstrophy accounts for 5% of UTA. This rate is identical to that found by N'diaye in Mali [30]. Initial treatment consisted of a plasty of the bladder, bladder neck, urethra and anterior abdominal wall associated with posterior iliac osteotomy; depending on the evolution, an enlargement can be proposed or a urinary derivation type Mitrofanoff [31].
Isolated epispadias with 3 cases remains a rare malformation; it was a penile continent epispadias in most cases and treated by urethroplasty [32].
Cystic dysplasia was diagnosed in 2 patients (2.5%) and their management consisted of clinical and ultrasound surveillance as recommended in the literature [33].

Conclusion
Urinary tract anomalies are a group of relatively common diseases in children. In Congo, antenatal diagnosis is almost non-existent. This results in delay in management, the occurrence of complications, the most feared of which is renal failure. However, the majority of urinary tract anomalies consist of uncomplicated or less complicated forms with favorable prognosis and progression spontaneously or after surgical correction.