Pulmonary infarction occurs with all except-
Ref:Textbook of pathology ( Harsh Mohan) 6th edition, page no.127 Embolism of the pulmonary aeries may produce pulmonary infarction, though not always. This is because lungs receive blood supply from bronchial aeries as well, and thus occlusion of pulmonary aery ordinarily does not produce infarcts. However, it may occur in patientswho have inadequate circulation such as in chronic lung diseases and congestive hea failure. Grossly, pulmonary infarcts are classically wedge-shaped with base on the pleura, haemorrhagic, variable in size, and most often in the lower lobes . Fibrinous pleuritis usually covers the area of infarct. Cut surface is dark purple and may show the blocked vessel near the apex of the infarcted area. Old organised and healed pulmonary infarcts appear as retracted fibrous scars. Microscopically, the characteristic histologic feature is coagulative necrosis of the alveolar walls. Initially, there is infiltration by neutrophils and intense alveolar capillary congestion, but later their place is taken by haemosiderin, phagocytes and granulation tissue.
Saddle embolus at bifurcation
Blockage of 2nd and 3rd gen end aeries
Aerioles are blocked
None
Respiratory system