Companion Shadow

Companion Shadow
Companion shadow is a term used in describing radiographs that denotes the appearance of a smooth, homogenous, radiodensity with a well-defined margin that runs parallel with a bony landmark. Companion shadows represent soft tissue that overlies the respective bony landmark in profile. They are not seen in every radiograph and can be misinterpreted as pathology. Types of companion shadow * Clavicular companion shadow is a thin soft-tissue stripe along the upper edge of the clavicle.
Lange S., Walsh G. Radiology of chest diseases, 2nd Edition, 1998 * Rib companion shadows parallel the

ribs

and measure 1–5 mm in diameter project adjacent to the inferior and inferolateral margi ...
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