AlwaysgetaPAfilmtoavoidcardiacmagnificationExceptions trauma activecardiacchestpain unstable unabletocooperatewithprocedure SilhouetteSign Twosubstancesofthesamedensity indirectcontact cannotbedifferentiatedfromeachotheronx rayCommonlocationsLowerlobes diaphragmsRightheartborder RMLLeftheartborder LingulaLeftdiaphragm Heart ...