Pseudothrombosis of the infra-renal vena cava is a frequent finding du
ring post-contrast helical computed tomography (CT) studies of the abd
omen. Three hundred consecutive patients undergoing contrast-enhanced
helical studies were evaluated prospectively to document the incidence
of pseudothrombosis. Typical CT findings are illustrated and a signif
icant difference in incidence between the male and female population n
oted.