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