Companion shadows
Disclosures
- updated 19 Jun 2022:
Nothing to disclose
Updates to Article Attributes
Body
was changed:
Companion shadows are smooth, homogeneous, radiopaque shadows running parallel along the bones. In a study of 700 chest radiographs, Ben Felson found that 75% had companion shadows on the lower ribs 3.
Radiographic features
They appear secondary to soft tissues and intercostal muscles running along 3:
Practical points
Companion shadows need to be differentiated from periosteal reactions secondary to adjacent bony or soft tissue pathology.
-<p><strong>Companion shadows</strong> are smooth, homogeneous, radiopaque shadows running parallel along the bones. In a study of 700 <a href="/articles/chest-radiograph">chest radiographs</a>, <a href="/articles/benjamin-felson">Ben Felson</a> found that 75% had companion shadows on the lower <a href="/articles/ribs">ribs</a> <sup>3</sup>.</p><h4>Radiographic features</h4><p>They appear secondary to soft tissues and intercostal muscles running along <sup>3</sup>:</p><ul>-<li>inferior border of lower <a href="/articles/ribs">ribs</a>-</li>-<li>upper borders of <a href="/articles/clavicle">clavicles</a>-</li>-<li><a href="/articles/scapula">scapula</a></li>- +<p><strong>Companion shadows</strong> are smooth, homogeneous, radiopaque shadows running parallel along the bones. In a study of 700 <a href="/articles/chest-radiograph">chest radiographs</a>, <a href="/articles/benjamin-felson">Ben Felson</a> found that 75% had companion shadows on the lower <a href="/articles/ribs">ribs</a> <sup>3</sup>.</p><h4>Radiographic features</h4><p>They appear secondary to soft tissues and intercostal muscles running along <sup>3</sup>:</p><ul>
- +<li>inferior border of lower <a href="/articles/ribs">ribs</a>
- +</li>
- +<li>upper borders of <a href="/articles/clavicle">clavicles</a>
- +</li>
- +<li><a href="/articles/scapula">scapula</a></li>
References changed:
- 3. Felson B. Chest roentgenology. AITBS Publishers. (2018) ISBN 978-9374734872. <a href="http://books.google.com/books?vid=ISBN9789374734872">Google Books</a>
- 3. Felson B. Chest roentgenology. AITBS Publishers. (2018) ISBN 978-9374734872. https://www.amazon.co.uk/Chest-Roentgenology-Benjamin-Felson/dp/9374734877
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