The differential diagnosis of the lung cavitary lesions inclouds :

• infections: such as Streptococcus p, Staphylococcus aureus, Klebsiella p., mycobacterium
• pulmonary abscess: as complicated pneumonia
• mycobacterium tuberculosis infection
• septic Emboli
• aspergillosis: is caused by a fungus, Aspergillus fumigatus
• malignancies
• granulomatosis with polyangiitis, sarcoidosis and rheumatic nodules