title: Letter: Pneumopericardium.
mesh_terms: D006801:Humans; D006819:Hyaline Membrane Disease / Q000628:therapy; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000628:therapy; D011026:Pneumopericardium / Q000209:etiology*; D012122:Ventilators, Mechanical