Table 1.

Differences between acute and chronic venous disease seen with CT venography ³⁵

	Acute	Chronic
Vein diameter	Large	Small
Intraluminal attenuation	Low	High
Presence of collaterals	Few	Many
Vein wall thickness	Thin	Thick
Intraluminal synechiae	Absent	Sometimes present (seen with direct CTV)
Intraluminal calcification	Absent	Sometimes present