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Cervico-thoracic sign

The cervico-thoracic sign, a variant of the silhouette sign, believed to have been coined by Benjamin Felson. It helps to discern the anterior or posterior location of mass in the superior mediastinum on frontal chest radiographs. 

As the anterior mediastinum ends at the level of the clavicles and as such the upper border an anterior mediastinal lesions cannot be visualised extending above the clavicles. Any lesions with a discernible upper border above that level must be located posteriorly in the chest; i.e apical segments of upper lobes, pleura, or posterior mediastinum 3.


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