Embolism

    Pulmonary artery with septic emboli in the lumen (Fig.1). Septic embolus is composed of bacterial clump seen as purplish granules mixed with fibrin (Fig.2).

     When septic emboli lodged, infectious agent can spread out of the vessel causing regional infection resulting in tissue destruction and inflammatory response (Fig.3). 

     High magnification of purulent inflammation caused by bacterial septic emboli (Fig.4).

     Tumor emboli within pulmonary vessels (Fig.5). High magnification of tumor emboli in lumen of blood vessel (Fig.6).