title: Pneumothorax necessitans presenting as a presternal pneumothoracocele.
abstract: A 31-year-old woman who is an intravenous drug abuser developed sternoclavicular joint infection with mediastinal and subcutaneous tissue abscesses that communicated through an erosion in the manubrium caused by osteomyelitis. Air entrapment from a subsequent apical pneumothorax formed a localized anterior "pneumothoracocele." We referred to this condition as "pneumothorax necessitans," and we suggest including it in the differential diagnosis of anterior chest wall masses.
authors.affiliation: Department of Surgery, The University of Illinois at Chicago, 60612, USA.
authors.forename: S P
authors.initials: SP
authors.lastname: Tripathi
authors.forename: M G
authors.initials: MG
authors.lastname: Massad
authors.forename: V K
authors.initials: VK
authors.lastname: Mehta
authors.forename: E
authors.initials: E
authors.lastname: Benedetti
authors.forename: A S
authors.initials: AS
authors.lastname: Geha
mesh_terms: D000038:Abscess / Q000382:microbiology; D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006547:Hernia / Q000175:diagnosis; D006801:Humans; D007592:Joint Diseases / Q000382:microbiology; D008171:Lung Diseases / Q000175:diagnosis*; D008371:Manubrium / Q000382:microbiology; D010019:Osteomyelitis / Q000382:microbiology; D011030:Pneumothorax / Q000175:diagnosis* / Q000209:etiology; D013203:Staphylococcal Infections / Q000175:diagnosis; D013247:Sternoclavicular Joint / Q000382:microbiology; D013352:Subcutaneous Emphysema / Q000209:etiology; D015819:Substance Abuse, Intravenous