_:vb50950043 . _:vb50950043 . _:vb50950043 . _:vb50950043 "A pneumothorax that is characterized by a pneumothorax in which the pressure of intrapleural gas exceeds atmospheric pressure resulting in acute onset chest pain and shortness of breath."^^ . _:vb50950043 . _:vb50950043 "url:https://www.ncbi.nlm.nih.gov/pubmed/29961427"^^ .