"Painful Blue Leg"
Massive iliofemoral occlusion due to venous thromboembolism
Extensive vascular congestion and venous ischemia
Age 50-60s
Malignancy (20-40%)
Inherited thrombophilia
Pregnancy
Trauma/surgery
Immobilization
IVC filter
10% of cases are idiopathic and occur in patients without risk factors
Phlegmasia cerulea dolens
Deep venous thrombosis 
Phlegmasia alba dolens
Commotio cordis
Tinea capitis
Venous gangrene
Lymphogranuloma venereum
Pulmonary embolism