May Be Caused by

 Common

Amebic abscess

Bacterial abscess

Bleb

Bronchogenic carcinoma

Bulla

Coccidioidomycosis

Fungal disease

Isoniazid cyst

Metastasis

Opportunistic infection

Pneumatocele

Tuberculosis

 Uncommon

Amyloidosis

Behçet disease

Bronchial cyst

Granuloma

Hamartoma

Hodgkin disease

Hydatid cyst

Intralobar pulmonary sequestration

Lymphoma

Paragonimiasis

Parasitic disease

Pulmonary blastoma

Pulmonary infarction

Rheumatoid nodule

Traumatic cyst

Wegener granulomatosis