Golden S Sign

This PA chest x-ray shows right upper lobe collapse. The margin between opaque, collapsed lung and normal aerated lung shows lateral convexity inferiorly, consistent with a hilar mass as a cause of the collapse. This is known as the Golden S sign (because the margin takes on a sigmoid shape), and is most commonly due to a primary bronchogenic carcinoma.

There are peripheral pulmonary nodules bilaterally that are consistent with pulmonary metastases.

Credit: Dr Laughlin Dawes