Objective To investigate the risk factors and clinical features of epididymal obstructive azoospermia.Methods We retrospectively studied the records of 141 cases with epididymal obstructive azoospermia from January 2014 to December 2015.All the cases were divided into two groups such as simple epididymal obstructive azoospermia group and complex epididymal obstructive azoospermia group.The clinical data and risk factors of two groups were comparatively analyzed.All cases were confirmed by the surgical opera...