A 30 year-old male with a known congenital right sided urete…
A 30 year-old male with a known congenital right sided ureteropelvic junction (UPJ) obstruction presents for a renal ultrasound with symptoms of spiking fever, significant leukocytosis and extreme right flank pain. Sonography revealed this image of the right kidney. Which one of the following conditions is most likely based on the information provided?
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