Cervicothoracic Sign
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References:

1) Marshall GB, Farnquist BA, MacGregor JH. Signs in Thoracic Imaging. J Thorac Imaging
2006;21(1):76-90
[PDF]

2) Whitten CR, Khan S, Munneke GJ. A Diagnostic Approach to Mediastinal Abnormalities.
Radiographics 2007;27:657-671
[PDF]