title: Pretracheal air cyst: late complication of tracheostomy.
mesh_terms: D002648:Child; D003560:Cysts / Q000209:etiology*; D005260:Female; D005402:Fistula / Q000209:etiology; D006801:Humans; D012871:Skin Diseases / Q000209:etiology; D013997:Time Factors; D014133:Tracheal Diseases / Q000209:etiology*; D014140:Tracheotomy / Q000009:adverse effects*