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Can a lung nodule be mistaken for pneumonia? 

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Interpretation of the appearance of the lung on CT scans was accurate in diagnosing usual interstitial pneumonia, sarcoidosis, and lymphangitic carcinomatosis.
This type of pneumonia is very unusual and should be included in the differential diagnosis of multiple nodular densities of the lung.
Our findings suggest that the combination of cytological bronchoalveolar lavage and histological transbronchial lung biopsy data obtained during a fibreoptic procedure appears to be an effective method for the initial investigation in cryptogenic organizing patients pneumonia presenting with patchy radiographic shadows.
The manifestations revealed on CT of bacterial, viral, and fungal pneumonia after lung transplantation are similar, consisting of a combination of consolidation, ground-glass opacification, septal thickening, pleural effusion, or multiple nodules.
The radiologic pattern of subtle lung nodules is poorly simulated by nodule phantoms with simple spherical or disk shapes.

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