hilum overlay sign

Imaging A radiologic finding consisting of a well-circumscribed mass in the anterior or posterior mediastinum which may simulate an enlarged cardiac border and be misinterpreted as cardiomegaly Etiology Tumors, abscesses, TB

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References in periodicals archive ?

A chest X-ray (CXR) was performed, and the antero-posterior view demonstrated the hilum overlay sign.

Felson described the hilum overlay sign as the visualisation, on a frontal X-ray, of the first bifurcation of either the left or right pulmonary artery more than 1 cm medial to the lateral edge of the cardiac shadow.

The hilum overlay sign is present on a frontal chest radiograph when normal hilar structures can be visualised through a mass, which implies that the mass is either anterior or posterior to the hilum.

The hilum overlay sign in a child

A typical posterior mediastinal mass displaying the hilum overlay sign is vertebral in origin in the majority (88%) of cases.