title: Trans-mediastinal herniation of bulla: Semilunar sign.
abstract: Trans-mediastinal herniation of lung is seen occasionally but herniation of bulla across the mediastinum is rare. We report two cases with trans-mediastinal herniation of bullae leading to an unusual line appearing near the mediastinum. We propose the name 'Semilunar sign'for this radiological sign because of its resemblance to the half-moon shape.
authors.affiliation: Department of Chest and Tuberculosis, Institute of Respiratory Diseases, Asthma Bhawan, Jaipur, India.
authors.forename: Sheetu
authors.initials: S
authors.lastname: Singh
authors.affiliation: Respiratory Medicine, Consultant, Asthma Bhawan, Jaipur, India.
authors.forename: Nishtha
authors.initials: N
authors.lastname: Singh
authors.affiliation: Director, Asthma Bhawan, Jaipur, India.
authors.forename: Virendra
authors.initials: V
authors.lastname: Singh
keywords: Bulla; chronic obstructive pulmonary disease; trans-mediastinal herniation