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22 yo male with penetrating trauma near the right superficial femoral artery 40 days ago.
Swirling blood flow in a pseudoaneurysm on ultrasonography ...
This appearance resembling ancient chinese symbol : YIN YANG

The yin-yang sign is helpful in facilitating diagnosis of partially thrombosed true arterial aneurysms and false aneurysms.
This sign may be seen on ultrasonography or contrast CT scans ; a well-defined round or oval mass with increased echo or attenuation in half of its area and decreased echo or attenuation in the other half .( Yin and Yang:The Paradox of Advances in Imaging )

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Comment by M.T Niknejad on February 5, 2011 at 3:50pm
Thanks again dear radRounds team ...
Comment by radRounds Radiology Network on February 5, 2011 at 12:43pm
Nice demonstration of the Ying Yang Sign in a PSA

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