Etiologies-solitary pulmonary nodule

Benign (70%)

Granuloma (80%): TB, histo, coccidio Hamartoma (10%) Bronchogenic cyst, AVM, pulm infarct Echinococcosis, ascariasis, aspergilloma GPA, rheumatoid nodule, sarcoidosis Lipoma, fibroma, amyloidoma

Malignant (30%)

Bronchogenic carcinoma (75%) periph: adeno (most common) & large cell central: squamous & small cell Metastatic (20%): sarcoma, melanoma, breast, head & neck, colon, testicular, renal Carcinoid, primary sarcoma