Differential diagnosis of a solitary pulmonary nodule includes all of the following except:

Solitary pulmonary nodule- discrete, well-marginated, rounded opacity less than or equal to 3 cm in diameter that is completely surrounded by lung parenchyma, does not touch the hilum or mediastinum, and is not associated with adenopathy, atelectasis, or pleural effusion. Causes of solitary pulmonary nodules: Tumors Inflammatory Bronchogenic carcinoma Solitary pulmonary metastasis Lymphoma Carcinoid tumour Pulmonary hamaoma Granuloma Lung abscess Rheumatoid nodule Pulmonary inflammatory pseudotumour - plasma cell granuloma Small focus of pneumonia - round pneumonia