What are the differential diagnoses for a solitary pulmonary nodule? (list 10)

1. Granuloma caused by fungal infection (e.g., histoplasmosis) or tuberculosis
2. Primary carcinoma
3. Abscess
4. Hamartoma (popcorn calcification is virtually diagnostic)
5. Solitary metastasis (colon, breast, kidney, ovary, or testis most common)
6. Sequestration
7. AVM; usually single (if multiple, consider Osler-Weber-Rendu disease)
8. Fluid in an interlobar fissure
9. Pleural plaque
10. Skin lesion (e.g., nipple shadow, mole, lipoma)