What type of venography uses contrast injected into the CFV?

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The use of contrast injected into the common femoral vein (CFV) is characteristic of descending venography. This type of venography involves injecting a contrast agent into a vein and observing the flow of contrast as it moves down toward the peripheral veins of the lower extremities. The primary aim of descending venography is to evaluate the veins, particularly in cases where deep vein thrombosis (DVT) is suspected.

In ascending venography, in contrast, the contrast agent is introduced at the peripheral veins and moves upward toward the CFV, allowing for the assessment of venous obstruction or other anomalies as the contrast travels toward the heart. The term "transverse venography" is not commonly used in the context of venography and does not describe a method of injecting contrast in this manner. Radial venography typically refers to imaging of the radial veins in the upper extremity, which is unrelated to the CFV.

This information helps clarify the reason why descending venography is the correct choice when discussing the injection of contrast material specifically into the common femoral vein.

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