Han BH, et al. - Physicians aimed to evaluate the usefulness of testicular volume, apparent diffusion coefficient (ADC), and normalized ADC as measured using MRI in predicting the histopathologic grade of azoospermia and in differentiating obstructive from nonobstructive azoospermia. In predicting the histopathologic grade of azoospermia and in differentiating obstructive from nonobstructive azoospermia, testicular volume, ADC, and normalized ADC (measured using MRI) were found to be useful.