Diffuse pulmonary meningotheliomatosis, primary lung adenocarcinoma


Minute pulmonary meningothelial nodules are typically low attenuation and often have a ring appearance with central low attenuation giving rise to the 'cheerio sign' (US), or ‘fruit loop’ sign (Australia). Although the nodules themselves are benign, there is a higher incidence of malignant lung cancers especially adenocarcinoma in the presence of these nodules compared to the general population.

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