Abstract

Pulmonary and systemic diseases, which have clinical evolutions as cavity formation in the lung, make up a wide spectrum. Benign cystic and cavitary pulmonary lesions are categorized in nine etiological subgroups: developmental, infectious, immunologic, thromboembolic, inhalational, traumatic, drug-induced, and idiopathic. The characteristics of the cavity provide information about the etiology. The features of the wall and the content of the cavity, the localization and the number of the lesions, and the surrounding lung parenchyma may be evaluated by computed tomography (CT). In the differential diagnosis, in addition to the clinical findings, the contribution of CT is important.