acquired blocks of cauda epididymis ( 34 cases ) and vas ( 23 cases ) were significantly more commonly associated with serum antisperm antibodies than congenital bilateral absence of vasa ( 29 cases ) or blocks at the caput epididymis ( 48 cases ) , most of which were associated with sinusitis , bronchitis or bronchiectasis ( young 's syndrome ) .
C0228024
cauda epididymis
C0014533
epididymis