Infection | Bacteria e.g. Actinomyces spp., Nocardia spp., Mycobacterium spp.; Fungi e.g. Aspergillus spp., Cryptococcus spp., pneumocystosis; Parasites e.g. Echinococcus spp. |
Pneumonia |
Lung abscess |
Septic (metastatic) embolism |
Autoimmune disease | Granulomatosis with polyangiitis |
Sarcoidosis |
Rheumatoid arthritis |
Ankylosing spondylitis |
Systemic lupus erythematosus |
Malignancy | Primary lung cancer, mostly squamous cell |
Lymphoma |
Lung metastasis |
Kaposi’s sarcoma |
Congenital abnormality/acquired lung disease | Bronchogenic cyst |
Histiocytosis X (langerhans histiocytosis) |
Lymphangioleiomyomatosis |
Vascular disease | Pulmonary embolism (septic or aseptic) |
BOOP/COP | Due to e.g. medication, radiotherapy or autoimmune disease |