[Intermittent hydronephrosis in childhood].

Introduction: Intermittent pelviureteric junction obstruction, and its consequence,intermittent hydronephrosis is a difficult condition to identify. The renal collecting system is not dilated between the episodes of abdominal pain attacks and a prompt investigation is hard to carry out during the time of painful crisis. Therefore, most of the patients are initially misdiagnosed.

Aim: The aim of the study was to assess the occurrence and the clinical characteristics of this phenomenon in children operated in the Department of Urological Surgery, Heim Pál Children Hospital, Budapest, Hungary.

Patients And Methods: Medical records of children operated for hydronephrosis between 2008 and 2012 were reviewed. The occurrence rate and clinical features of intermittent hydronephrosis were analyzed.

Results: 76 children were operated for pelviureteric junction obstruction, of which 10 met the criteria of intermittent hydronephrosis. The average interval between the onset of symptoms and the final diagnosis was 2 years and 4 months. In 7 patients pyeloplasty, and in 3 patients nephrectomy were performed.

Conclusions: Intermittent hydronephrosis represents a well-defined proportion among cases operated for hydronephrosis. The delay in diagnosis led to the loss of the kidney in one third of the patients, and this finding urges for the awareness of health professionals for this phenomenon. In case of recurrent abdominal pain of unknown etiology one must suspect a urological origin, even if a previous abdominal ultrasound showed normal kidneys.