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A 40-year-old patient presented to the clinic with a months history of symptoms related to upper gastrointestinal problem. He had no problems with urination, there were single episode of nocturnal diuresis. He never had any hypertension or medical problem before. His previous history and social history were unremarkable. On examination his general condition was good. His blood pressure was 130/80 mm Hg and pulse was 74 beats/min. Abdominal examination revealed any clinical sign of gastro-oesophageal reflux. There was no costovertebral angle tenderness.
Clinical and biochemical blood test includes urinalysis were normal. His glomerular filtration rate (GFR) was 87.83 mL/min/1.73 m2. He had esophagogastroduodenoscopy which showed signs of gastro-oesophageal reflux disease and chronic gastritis. Abdominal ultrasound showed incidental findings of significant dilatation of the collecting system on the left side. This finding was further investigated using more detailed imaging. Abdominal CT with intravenous contrast enhancement was conducted (figure 1). Conclusion: grade III hydronephrosis on the left at the background of uteropelvic junction (UPJ) stenosis with probable conflict of the additional renal artery and the lower segmental vein. Renal scintiangiography: renal haemodynamics parameters are normal. The secretory and excretory functions of the right kidney are not impaired. On the left—reduction in the volume of functioning parenchyma with mixed-type excretory functions inhibition with the presence of parenchymal and, mainly, obstructive components. The patient underwent surgery: laparoscopic left UPJ plasty. A temporary stent was inserted in the left ureter. Biopsy material investigation—microscopic signs correspond to the UPJ stenosis. One month after the surgery, the control ultrasound showed dilation of the collecting system on both sides. There was no residual urine. Given the positive changes showed by ultrasound, renal CT with contrast was not performed. Follow-up blood tests and urine analyses remain within normal limits. The treatment prescribed by the gastroenterologist had a quick positive effect.
Hydronephrosis is a persistent and progressively increasing expansion of the collecting system, accompanied by urine retention due to the outflow obstruction. The most frequent causes are congenital abnormalities.1 Acquired causes include urolithiasis, strictures due to postoperative or inflammatory changes, adhesions, polyps and malignant neoplasms. Aberrant renal artery is a rare cause of hydronephrosis in adults. Aberrant renal artery to the inferior pole crosses the anterior UPJ in 6.8% of cases. In very rare cases, it passes so close to the UPJ that it provokes the development of hydronephrosis.2 In some cases, an aberrant renal artery was found passing behind the ureter.3
The most frequent symptoms of hydronephrosis are: intermittent abdominal or flank pain, nausea, vomiting, dysuria and haematuria.1 As a rule, hydronephrosis has a progressive course, which contributes to an increase in the dilation of the segments of upper urinary tract and can lead to acute kidney damage, and in the absence of proper treatment—to its irreversible loss.4 The presence of more than 1000 mL of fluid in the collecting system of an adult indicates the giant hydronephrosis. This condition largely worsens the prognosis, as it leads to more significant damage to the kidney, in some cases resulting in kidney resection.5 Kidney ultrasound is recommended as a screening for hydronephrosis. More detailed information about the upper segments of the urinary tract can be obtained using kidney CT with contrast enhancement.4 Outcomes in patients with hydronephrosis due to additional renal artery significantly depend on early diagnosis and appropriate surgical interventions, including ureteric stenting (successfully performed in this case) or laparoscopic dismembered pyeloplasty with the pelviureteric anastomosis being placed anterior to the additional vessel.
The clinician should be aware that congenital vascular abnormalities can provoke the development of hydronephrosis not only in newborns, but also in middle-aged individuals, and that this pathology can be asymptomatic.
Hydronephrosis can be asymptomatic with normal blood test parameters and urinalysis.
This condition is easily diagnosed with the use of ultrasound. Detailed imaging technique is required to investigate the cause.
Аdditional renal artery can be one of the causes of hydronephrosis.
Early surgical interventions can prevent impairment of kidney function and improve patient’s prognosis.
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Contributors MV, AP, UB, VP participated in data collection, interpretation, article concept planning. AP participated in the writing of the manuscript. VP participated in the editing the manuscript. All authors have read the final version of the manuscript and agree to publication.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent for publication Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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