<prompt> The following are direct signs of Lung collapse seen on the Chest X-ray except:Mediastinal shiftDisplacement of the fissureCrowding of the vesselsLoss of aeration  <response>: Ans. A. Mediastinal shift. Ref. Sutton radiology 7th ed. 161Direct signs of lung collapse includeIndirect signs are:i opacity of the affected lobesii crowding of the vessels and bronchi within the collapsed area:iii displacement or bowing of the fissures.i compensatory hyperinflation of the normal lung or lobes resulting in an increase in transradiancy with separation of the vascular marking;ii displacement of the mediastinal structures toward the affected side.iii displacement of the ipsilateral hilum which changes shape.Special signs of Lung Collapse:1.Rounded atelectasisComet tail sign vascular shadows seen radiating from opacity. Known in Asbestosis.2.Goldens S signRight hilarcentral mass with upper lobe collapse seen as convexity at the medial aspect of pulled up major fissure.3.Broncholobar signLower lobe bronchus is displayed within the opacity of the collapsed left lower lobe.4.Luftsiche! signGerman words luft air, sichel sickle, literally describes an air crescent which may be seen between the aortic arch and the medial border of the collapse .The hyperextended superior segment of the ipsilateral lower lobe accounts for the paramediastinal lucency outlining the medial surface of the collapsed right or left upper lobe. 