Congenital absence of the valves in the veins as a cause of varicosities.
CURTIS
A C
AC
HELMS
R W
RW
D006801:Humans; D014648:Varicose Veins / Q000151:congenital*; D054079:Vascular Malformations; D014680:Veins / Q000002:abnormalities*
VARICOSE VEINS/congenital; VEINS/abnormalities