Hyperoxaluria and urinary tract calculi after jejunoileal bypass.

Five patients with jejunoileal shunt for morbid obesity in whom postshunt hyperoxaluria and recurrent urinary tract calculi developed are presented. All the stones were composed of calcium oxalate. The twenty-four hour urinary oxalic acid levels were also elevated in twenty of twenty-six patients who had had jejunoileal shunt for six months or longer. No correlation was present between urolithiasis and the degree of hyperoxaluria.