Malbrain proposed several criteria to diagnose PRL as follows: (i) acute renal failure at the presentation in the absence of other causes of renal impairment; (ii) rapid improvement of renal function after treatment; (iii) increased kidney size without any urinary tract obstruction; (iv) an absence of other nodal involvement beyond the kidney; (v) a confirmed diagnosis made by biopsy [3]. This evidence concerns the gene PRL and urinary tract obstruction.