What the heck is this new periductal hypoechoic sign?

References 

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3. Don Henley. The heart of the matter video. Youtube website http://www.youtube.com/watch?v=FLgUuHl2xJoAccessed September 22, 2008
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9. Five Man Electrical Band. Signs video. Youtube website http://www.youtube.com/watch?v=fqow0Jvq6OEAccessed September 22, 2008