Inferior vena caval thrombosis
Severe hypotension. bilateral swollen legs.
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Dilated non enhanced IVC/iliac veins below the filter. This could be flow phenomenon but the collapse of the IVC above the filter is compelling
Signs of hypovolemia - completely collapsed IVC above the filter and underfilled right atrium/ventricle. The same volume of blood flows through the right ventricle as the left ventricle and the lumen of these two cardiac chambers is usually very similar.