— Primary infection most commonly anywhere, has associated adenopathy, Ghon focus is primary infection in lung, Ghon complex is primary infection in lung + hilar lymphadenopathy, Ranke complex is calcified Ghon complex
— Secondary infection is reactivation, infection most commonly (90%) in apices, does not have lymphadenopathy
— Methods of spread are bronchogenic, lymphatic, hematogenous / miliary to lungs + kidneys + liver + brain
CXR and CT of the chest shows bilateral hilar adenopathy and a left upper lobe infiltrate.CXR PA and lateral shows massive bilateral hilar lymphadenopathy with the lungs being clear.