A 72-year-old woman presents with swelling of her right leg that developed overnight.

This patient has classic features of proximal deep vein thrombosis (DVT) after recent major pelvic surgery: acute unilateral leg swelling with pitting edema and a significant calf circumference difference ( > 3 cm). The edema extending from foot to groin strongly suggests a proximal (iliofemoral) thrombosis, which produces more extensive swelling than calf-vein DVT because venous outflow from the entire limb is impaired. MCCQE objectives highlight postoperative patients as high risk for venous thromboembolism due to immobility, endothelial injury, and hypercoagulability.

Superficial thrombophlebitis typically causes a localized, tender, palpable cord along a superficial vein rather than diffuse whole-leg edema. Phlegmasia cerulea dolens is a severe, limb-threatening form of massive DVT characterized by marked pain, tense