Symptoms and Signs – Differential Diagnosis of Cavitary Lesion on Chest Radiograph
NECROTIZING INFECTIONS • Bacteria: anaerobes, Staphylococcus aureus, enteric gram-negative bacteria, Pseudomonas aeruginosa, Legionella species, Haemophilus influenzae, Streptococcus pyogenes, Streptococcus pneumoniae, Rhodococcus, Actinomyces • Mycobacteria: Mycobacterium tuberculosis, Mycobacterium kansasii, Mycobacterium avium-intracellulare (MAI) • Bacteria-like: Nocardia species • Fungi: Coccidioides immitis, Histoplasma capsulatum, Blastomyces hominis, Aspergillus species, Mucor species • Parasitic: Entamoeba histolytica, Echinococcus, Paragonimus westermani CAVITARY INFARCTION • Bland infarction (with or without superimposed infection) • Lung contusion SEPTIC EMBOLISM • S. aureus, anaerobes, others VASCULITIS • Wegener’s granulomatosis, periarteritis NEOPLASMS • Bronchogenic carcinoma, metastatic carcinoma, lymphoma MISCELLANEOUS LESIONS • Cysts, blebs, bullae, or pneumatocele with or without fluid collections • Sequestration • Empyema with air-fluid level • Bronchiectasis
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