Which of the following is an absolute ultrasound criterion of acute deep venous thrombosis?

The identification of an absolute ultrasound criterion for acute deep venous thrombosis (DVT) is critical for accurate diagnosis and appropriate management. Noncompressible, hypoechoic vein is considered an absolute criterion in this scenario because when a vein is affected by DVT, it typically cannot be compressed with applied pressure during the ultrasound examination. This lack of compressibility indicates the presence of a thrombus obstructing the vein.

Additionally, the echogenicity of the thrombus may appear hypoechoic compared to surrounding tissue, providing further evidence of thrombosis. In practice, an experienced sonographer or physician will assess the ability to compress the vein and the echogenic characteristics of the venous lumen to definitively diagnose DVT.

The other criteria mentioned, such as intraluminal filling defects or absent color-flow signals, can indicate the presence of DVT, but they may not be as definitive as the noncompressibility criterion. These alternative findings could also be present in other vascular conditions or anomalies. Thus, the noncompressible, hypoechoic vein remains a key indicator that holds a strong level of diagnostic confidence in the evaluation of acute deep venous thrombosis.