Table 1.

Demographic data of patients (n=19)

Factors	No. of patients (% total)
Male gender	14 (73.7%)
Age ≤40 yrs	12 (63.2%)
Initial left-sided DVT	16 (84.2%)
Risk factors for DVT
Malignant tumor	2 (10.5%)
Post trauma	4 (21.1%)
Calf soft tissue infection	3 (15.8%)
Post operation	2 (10.5%)
Postpartum	2 (10.5%)
APS	1 (5.3%)
Unknown	5 (26.3%)
Symptoms of caval thrombosis
Unilateral limb swelling	4 (21.1%)
Bilateral limb swelling	15 (88.9%)
Pain	8 (42.1%)
Limb cyanosis	6 (31.6%)
Limb pallescence	7 (36.8%)
Rising skin temperature	3 (15.8%)

DVT, deep venous thrombosis; APS, antiphospholipid syndrome.