![]() ![]() Unfortunately, considerable overlap in etiology and pathophysiology exists between these two categories. Some have tried to make this distinction by defining cysts as being air-containing spaces surrounded by a thin (4 mm or less) wall and cavities as being as air-containing spaces with walls that are at least 5 mm thick ( 322). In theory, one would like to distinguish a cavity from other air- or fluid-filled lung structures with different pathophysiologies, but in practice, this is not always possible. ![]() A cavity has been defined in the radiology literature as (pathologically) “a gas-filled space within a zone of pulmonary consolidation or within a mass or nodule, produced by the expulsion of a necrotic part of the lesion via the bronchial tree” and (radiographically) “a lucency within a zone of pulmonary consolidation, a mass, or a nodule hence, a lucent area within the lung that may or may not contain a fluid level and that is surrounded by a wall, usually of varied thickness” ( 368).
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