239Lu Central Squamous Cell Carcinoma with left Upper Lobe Atelectaisis Left Upper Lobe Atelectasis (Collapse) Caused by Central Squamous Cell Carcinoma82-year-old female with dyspnea presents with an obstructing and infiltrating central squamous cell carcinoma of the left main stem bronchus with secondary post obstructive atelectasis of the left upper lobe of the lung. A small region of the anterior segment is spared. There is hyperinflation of the left lower lobe. Note the relative lucency of the left lung compared to the right.Ashley Davidoff MD TheCommonVein.net Left Upper Lobe Atelectasis (Collapse) Caused by Central Squamous Cell Carcinoma82-year-old female with dyspnea presents with an obstructing and infiltrating central squamous cell carcinoma of the left main stem bronchus with secondary post obstructive atelectasis of the left upper lobe of the lung. There is hyperinflation of the left lower lobe. Note the relative lucency of the left lung compared to the right.. Note the spiculated and calcified lesion at the base of the left breast with extension of the soft tissue changes to the chest wallAshley Davidoff MD TheCommonVein.net Left Upper Lobe Atelectasis (Collapse) Caused by Central Squamous Cell Carcinoma82-year-old female with dyspnea presents with an obstructing and infiltrating central squamous cell carcinoma of the left main stem bronchus with secondary post obstructive atelectasis of the left upper lobe of the lung. In addition, there is encasement of the left pulmonary artery and a small left effusion. A spiculated lesion at the base of the left breast in close association with the left pectoralis muscle The lesion also extends beyond the muscle to abut the rib. There is a small amount of fluid in the pericardial recess, and an small left pleural effusion.Ashley Davidoff MD TheCommonVein.net RnD case 239Lu Left Upper Lobe Atelectasis (Collapse) Caused by Central Squamous Cell Carcinoma82-year-old female with dyspnea presents with an obstructing and infiltrating central squamous cell carcinoma of the left main stem bronchus with secondary post obstructive atelectasis of the left upper lobe of the lung. In addition, there is encasement of the left pulmonary artery and a small left effusion. A spiculated lesion at the base of the left breast in close association with the left pectoralis muscle The lesion also extends beyond the muscle to abut the rib. There is a small amount of fluid in the pericardial recess, and an small left pleural effusion.Ashley Davidoff MD TheCommonVein.net RnD case Left Upper Lobe Atelectasis (Collapse) Caused by Central Squamous Cell Carcinoma82-year-old female with dyspnea presents with an obstructing and infiltrating central squamous cell carcinoma of the left main stem bronchus with secondary post obstructive atelectasis of the left upper lobe of the lung. There is hyperinflation of the left lower lobe with a Luftsichel-sign characterised by the hyperinflated left lower lobe manifesting in the left apex..Ashley Davidoff MD TheCommonVein.net Left Upper Lobe Collapse by Central Squamous Cell Carcinoma82-year-old female with dyspnea presents with an obstructing lesion of the left main stem bronchus and total atelectasis of the left lung caused by a central squamous cell carcinoma mass. The scout film (a) shows a vague area of increase density in the left upper lung field, with minimal elevation of the left mainstem bronchus. The central mass (white asterisk – is noted in c, d, g, j, k and l. Invasion and obstruction of the left main stem bronchus (black arrow – f, g) with invasion into the lumen without obstruction is notes in I – orange arrow. Post obstructive atelectasis of the left upper lobe is noted (red asterisk – b,c,j,k,l) with hyperinflated left lower lobe extending to the left apex.Ashley Davidoff MD TheCommonVein.net