What are the differential diagnoses for cavitary masses? (list six)

Cancer (i.e., bronchial carcinoma, especially squamous cell carcinoma, metastasis, and lymphoma)
Autoimmune disease (e.g., rheumatoid arthritis, Wegener's granulomatosis)
Vascular disorders (e.g., pulmonary infarct)
Infection (e.g., staphylococcal or gram-negative pneumonia, lung abscess, septic emboli, tuberculosis)
Trauma
Youth (i.e., congenital disorders, such as sequestration or cyst)

CAVITY