Crossed renal ectopia (C-RE) is a rare congenital anomaly in which both kidneys are located unilaterally. The crossed kidney is situated on the side opposite to its ureteral orifice and usually lies below the normal kidney. The frequency of this malformation is estimated at 0.05% to 0.1%. Most of the patients remain asymptomatic. In other cases C-RE is diagnosed incidentally on routine ultrasonography, due to the presence of unspecific symptoms. The diagnosis of C-RE is possible due to a wide range of imaging techniques: US, IVU, CT, MRI, and TcDMSA scan. Among them IVU, CT, and MRI have the highest degree of confidence. The aim of this retrospective study was to present our own experience with 5 children affected with C-RE, emphasizing the differences in clinical picture and low sensitivity of ultrasound images. In all of them the final diagnosis was established by IVU or MRI.

Pediatric patients suffering from valve bladder syndrome (VBS) are at risk of developing chronic kidney disease (CKD) and renal failure in later life. Therefore, it is of vital importance to determine the risk factors and the best possible strategies for diagnosis and treatment in patients with VBS that would minimize the risk of developing CKD. In this review we have presented the current knowledge of CKD risk factors in patients with posterior urethal value (PUV). We have also discussed possible recommendations for prenatal diagnostics procedures to be undertaken in patients with PUV, postnatal monitoring and therapeutic strategies that could reduce the risk of developing CKD in this population. Although in most cases there are no clear guidelines for appropriate clinical actions that can be undertaken in patients with PUV to minimize the risk of kidney failure, we have tried to present concise and accurate advice for physicians taking care of patients with PUV.

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