Figure 26: a (1) A CXR of a 26 year old man of North African decent presented with dyspnea for 6 months. The CXR shows bilateral hilar prominence and right perihilar shadowing. (b) (2) Axial CT scan seen on a mediastinal window show atelectasis of the medial segment of the middle lobe (arrow). A bronchoscopy was undertaken, which revealed a small polypoid endobronchial lesion, which was resected. Histological examination revealed non-caseating granulomas suggestive of endobronchial sarcoid lesion. Subsequently, angiotensin-converting-enzyme levels were found to be elevated at 66 IU/L. (3) A axial CT scan just above the diaphragm shows supradiaphragmatic lymphadenopathy. (c) (4 and 5) Follow up radiographs following corticosteroids, 6 months apart show complete resolution of the shadowing from the right lung