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Figure 3d. Case of a 34-year-old woman who presented early in the postpartum period with buttock, groin, and upper thigh pain. (a) Transverse US image of the common femoral vein (arrow) shows a noncompressible segment with distention of the vein from acute thrombus. This also involved the proximal superficial femoral vein. Distance between cursors (1, dotted line) is 1.07 cm. (b, c) US images demonstrate normal compressibility of popliteal segment. (b) Transverse image of the popliteal artery (red) and vein (blue) shows spontaneous venous flow. (c) With compression, there is complete apposition of the vein walls, while the artery (arrowhead) is patent; this excludes popliteal vein thrombosis. (d) Longitudinal color Doppler image along the left iliac artery (yellow and blue) and thrombosed left iliac vein (arrowheads). Note that a lower frequency transducer was required to visualize the vessels due to their deeper location in the pelvis. (e) Longitudinal color Doppler image demonstrates the patent inferior vena cava (orange) in this patient.