Hilum overlay sign
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The hilum overlay sign refers to an appearance on frontal chest radiographs of patients with a mass projected at the level of the hilum which is in fact either anterior or posterior to the hilum.
When a mass arises from the hilum, the pulmonary vessels are in contact with the mass and as such their silhouette is obliterated. The ability to see the edges of the vessels through the mass implies that the mass is not contacting the hilum, and is therefore either anterior or posterior to it. Most of these masses are found to be in the anterior mediastinum.
The sign was first described byBenjamin Felson 2.
-<p>The <strong>hilum overlay sign</strong> refers to an appearance on frontal chest radiographs of patients with a mass projected at the level of the hilum which is in fact either anterior or posterior to the hilum.</p><p>When a mass arises from the hilum, the pulmonary vessels are in contact with the mass and as such their silhouette is obliterated. The ability to see the edges of the vessels through the mass implies that the mass is not contacting the hilum, and is therefore either anterior or posterior to it. Most of these masses are found to be in the <a href="/articles/anterior-mediastinum">anterior mediastinum</a>.</p><p>The sign was first described by <a href="/articles/benjamin-felson">Benjamin Felson</a> <sup>2</sup>.</p>- +<p>The <strong>hilum overlay sign</strong> refers to an appearance on frontal chest radiographs of patients with a mass projected at the level of the hilum which is in fact either anterior or posterior to the hilum.</p><p>When a mass arises from the hilum, the pulmonary vessels are in contact with the mass and as such their silhouette is obliterated. The ability to see the edges of the vessels through the mass implies that the mass is not contacting the hilum, and is therefore either anterior or posterior to it. Most of these masses are found to be in the <a href="/articles/anterior-mediastinum">anterior mediastinum</a>.</p><p>The sign was first described by <a href="/articles/benjamin-felson">Benjamin Felson</a> <sup>2</sup>.</p>
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