Companion shadow

AP radiograph demonstrating companion shadow of the clavicle
A rib companion shadow (indicated by two arrows)

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

References

  1. , Lange S., Walsh G. Radiology of chest diseases, 2nd Edition, 1998
  2. , Kurihara Y., Yakushiji Y.K., Matsumoto J., Ishikawa T., Hirata K., The Ribs: Anatomic and Radiologic Considerations, January 1999 RadioGraphics, 19, 105-119.
  3. , Lams p.m., Jolles H., The scapula companion shadow, January 1981 Radiology, 138, 19-23.
This article is issued from Wikipedia - version of the Saturday, April 02, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.