Fig. 3

Femoral and popliteal vein POCUS. a The illustration shows the two points of the lower extremities assessed for DVT: the common femoral vein at the groin level and popliteal vein at the popliteal fossa. b, c Ultrasound images showing the vein marked with yellow arrows before (b) and after (c) external compression has been applied. In this case, the vein is entirely collapsible, consistent with absence of a DVT. DVT deep venous thrombosis, POCUS point-of-care ultrasound