title: Air-trapping zone surrounding sclerosing hemangioma of the lung.
abstract: We present two cases of sclerosing hemangioma of the lung with a peculiar radiologic finding: an air-trapping zone surrounding the tumor. On microscopic examinations, the tumor was of the hemangiomatous subtype, and the radiolucent zone corresponded to enlarged alveoli with septal destruction. A possible mechanism in the production of an air-trapping zone around a sclerosing hemangioma is bleeding from the highly vascular tumor followed by expectoration in communication with an airway. We reviewed the literature on the air meniscus sign in sclerosing hemangioma and concluded that although it is not a common finding, it could be of help in the confident diagnosis of sclerosing hemangioma and in differentiating it from other benign tumors of the lung.
authors.affiliation: Department of Diagnostic Radiology and Research Institute of Radiological Science, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Ji Eun
authors.initials: JE
authors.lastname: Nam
authors.forename: Young Hoon
authors.initials: YH
authors.lastname: Ryu
authors.forename: Sang Ho
authors.initials: SH
authors.lastname: Cho
authors.forename: Young-Jun
authors.initials: YJ
authors.lastname: Lee
authors.forename: Hyung Jung
authors.initials: HJ
authors.lastname: Kim
authors.forename: Doo Yun
authors.initials: DY
authors.lastname: Lee
authors.forename: Kyu Ok
authors.initials: KO
authors.lastname: Choe
authors.forename: Sang Jin
authors.initials: SJ
authors.lastname: Kim
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006470:Hemorrhage / Q000000981:diagnostic imaging / Q000473:pathology; D006485:Hemosiderin / Q000378:metabolism; D018219:Histiocytoma, Benign Fibrous / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D019568:Lung, Hyperlucent / Q000000981:diagnostic imaging* / Q000473:pathology; D016676:Macrophages, Alveolar / Q000473:pathology; D008875:Middle Aged; D011650:Pulmonary Alveoli / Q000000981:diagnostic imaging / Q000473:pathology; D011656:Pulmonary Emphysema / Q000000981:diagnostic imaging* / Q000473:pathology; D014057:Tomography, X-Ray Computed
chemical_list: D006485:Hemosiderin