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. 2020 Oct 1;40(6):1574–1599. doi: 10.1148/rg.2020200149

Figure 25d.

Popliteal and posterior tibial artery thrombosis in a 58-year-old woman with COVID-19 in the ICU. (a, b) Sagittal color (a) and spectral (b) Doppler US images show an echogenic heterogeneous thrombus (white arrows) distending the right popliteal artery. The characteristic knocking or “stump-thump” waveform with absence of diastolic flow (black arrows in b) and low amplitude (yellow circle in b) imply the presence of occlusion just distal to the area of interrogation. (c) Sagittal power Doppler US image shows no flow in the occluded right posterior tibial artery (black arrows). (d) Corresponding sagittal CT angiographic reconstruction shows abrupt cutoff of the popliteal artery by a thrombus (solid arrow). Note the opacified popliteal artery (Rt POP A) proximal to the thrombus (dashed arrow). The patient also had a liver infarct and bowel ischemia (not shown).

Popliteal and posterior tibial artery thrombosis in a 58-year-old woman with COVID-19 in the ICU. (a, b) Sagittal color (a) and spectral (b) Doppler US images show an echogenic heterogeneous thrombus (white arrows) distending the right popliteal artery. The characteristic knocking or “stump-thump” waveform with absence of diastolic flow (black arrows in b) and low amplitude (yellow circle in b) imply the presence of occlusion just distal to the area of interrogation. (c) Sagittal power Doppler US image shows no flow in the occluded right posterior tibial artery (black arrows). (d) Corresponding sagittal CT angiographic reconstruction shows abrupt cutoff of the popliteal artery by a thrombus (solid arrow). Note the opacified popliteal artery (Rt POP A) proximal to the thrombus (dashed arrow). The patient also had a liver infarct and bowel ischemia (not shown).