<prompt> Golden S sign is seen in:Bronchogenic carcinoma with collapse of lungTraction Bronchiectasis with apical scarringEmphysema with increased lucency and flattened diagphragmPulmonary edema  <response>: Ans. a Bronchogenic carcinoma with collapse of lung The Golden S sign reverse S sign of Golden. is seen in PA chest radiographs with right upper lobe collapse. It is caused by a central mass obstructing the upper lobe bronchus and should raise suspicion of a primary bronchogenic carcinoma. The right upper lobe appears dense and shifts medially and upwards with a central mass expanding the hilum. The combination of two changes together form a reverse S shane. 