The splenic ADC values were ( 1.339 0.482 ) 10 ( -3 ) mm ( 2 ) / s , ( 1.120 0.254 ) 10 ( -3 ) mm ( 2 ) / s and ( 0.997 0.447 ) 10 ( -3 ) mm ( 2 ) / s in the preoperative , postoperative and normal groups , respectively .