Hodgkin lymphoma: hilum overlay sign
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PA chest x-ray demonstrates a soft tissue density on the right side. Hilar vessels can be seen through the mass and the rest of the lungs and the pleura appear unremarkable.
Hilum overlay sign in a patient with mediastinal Hodgkin's lymphoma.
The hilum overlay sign refers to an appearance of frontal chest x- rays of patients with a mass located at the level of the hilum, but is either anterior or posterior to the hilum.