title: Superior herniation of the mediastinum presenting as an anterior neck mass on straining.
abstract: We report an infant with an anterior neck mass present only on straining. Airway fluoroscopy revealed this to be due to superior mediastinal herniation. Neck masses apparent only during Valsalva maneuver are rare and awareness of the differential diagnosis is important to avoid unnecessary investigation or surgery.
authors.affiliation: Department of Respiratory Medicine, British Columbia's Children's Hospital, Vancouver, Canada.
authors.forename: Catherine M
authors.initials: CM
authors.lastname: McDougall
authors.forename: Gordon
authors.initials: G
authors.lastname: Culham
authors.forename: Michael D
authors.initials: MD
authors.lastname: Seear
authors.forename: Mark A
authors.initials: MA
authors.lastname: Chilvers
mesh_terms: D006547:Hernia / Q000175:diagnosis*; D006801:Humans; D007223:Infant; D008297:Male; D008482:Mediastinum; D009333:Neck; D014636:Valsalva Maneuver