Case report

A 61-year-old non-smoking man, presented at our clinic with a 5-year history of chronic dry cough. He had undergone medication with antitussive agents for several years, but the drugs showed little therapeutic response. Chest radiographs did not show any apparent pulmonary parenchymal lesion, except for mildly higher density and irregularity over the tracheal border (figure 1A,B). CT scans showed diffuse submucosal calcified nodules protruding from …