This case epitomizes the concept of seeing the forest and the trees!
Even though you are looking for DVT and vein compressibility, make sure you are evaluating everything in the picture – you just might find the true pathology – whether that is an abscess, a hematoma, a lymph node or a Baker's cyst! Our bedside DVT studies involve 2--point compression of the common femoral and popliteal veins and the definitive ED question for DVT US is "is this vein completely compressible?" Our literature supports that 2--point US is as effective as whole leg ultrasound, but we must make sure to fully compress both the common femoral and popliteal veins to their branching points, using serial compressions every 1cm, typically for a total of 5 cm. Remember to apply enough pressure to compress the vein completely, but not too much that the artery is compressed as well. You can always use color doppler to verify you are evaluating the vein (or in this month's case, differentiate a vein from a cyst). A position of maximum venous distention can also help you, so if the patient isn't able to sit with their legs hanging off the stretcher, you can use reverse Trendelenburg and optimize your image by having the patient's hip externally rotated and knee slightly flexed.