This document contains multiple patient case summaries and medical images/reports with questions related to diagnosis and management. Some key cases include: - A 55-year-old male presenting with shortness of breath, whose chest X-ray shows cardiomegaly and upper lobe diversion. - A 35-year-old male with progressive shortness of breath and cough presenting with bilateral hilar lymphadenopathy on chest X-ray, leading to a diagnosis of sarcoidosis. - An ECG showing findings of atrial fibrillation in a 35-year-old female presenting with palpitations. - A CT scan of a 30-year-old IV drug user presenting with fever