How is the pathogenesis of lung abscesses?

Most are complications of aspiration pneumonia (due to reduced conscioussness or dysphagia) with periodontal diseases (gingivitis) Bacteria aren't cleared due to low consciousness, causes pneumonia first then progresses to tissue necrosis 7-14 days later, result in abscess/ empyema (due to fistula/ extension of infection to pleural space). May occur in Lemierre's syndrome/ jugular vein thrombophlebitis (begins in pharynx, spreads in neck and goes to jugular vein, causing bacteremia and septic emboli to lungs Tricuspid valve endocarditis (By staph - can cause septic emboli to both lungs)