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Boari flap reconstruction in a male infant with solitary kidney and associated megaureter. A 1-year-old male infant presented with fever and abdominal lump for 3 months with increased leucocyte count (15 300/mm3) and serum creatinine (0.83 mg%). Abdominal ultrasound and renal scan demonstrated solitary left kidney with dilated tortuous left ureter. Voiding cystourethrogram was unequivocal. Left percutaneous nephrostomy was placed after poor response to perurethral catheterisation. His serum creatinine dropped to 0.58 mg/dL. Subsequent percutaneous nephrostogram and CT nephrostogram showed dilated left pelvicalyceal system, dilated, tortuous left ureter. A diagnosis of obstructed megaureter was made and ureteric plication and reimplantation planned. Intraoperatively, there were primitive ureteral valves until proximal one-third of the ureter. The distance between the upper ureter and bladder was ∼6 cm. This defect was bridged by Boari flap. The postoperative period was uneventful and now after 6 months of follow-up, he is doing fine.