- Neoplasm
- Metastases from unknown primary (80%)
- Lymphoma
- Primary lung cancer
- Kaposi sarcoma in patients with HIV
- Infectious
- Pneumonia
- Multiple abscesses
- Septic emboli
- Inflammatory/Miscellaneous
- Wegener granulomatosis
- Sarcoidosis, rheumatoid arthritis, SLE
- Arteriovenous malformations and Weber-Osler-Rendu syndrome
- Pneumoconioses
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