The most favorable outcome of lung abscess is a complete collapse of a cavity with development of nidal fibrosis. As a stage of cicatrizing cavity an abscess looked like a small (less than 4 cm) parietal nidus with typical irregular or star-like shape, uneven serrate contour and heterogeneous structure because of short achromogenic air signals with prevailing hyperchromogenic background. At complete cicatrization of a cavity on its place we detected remaining small subpleural hypochromogenic area of irregular-shaped sclerosis, with uneven contours and significantly decreased or absent respiratory mobility. Less favorable outcome is formation of residual achromogenic air cavity similar to false cyst.
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