![]() ![]() Grey hepatization: Red blood cells disintegrate, with persistence of the neutrophils and fibrin.This appearance has been likened to that of the liver, hence the term "hepatization". The filling of airspaces by the exudate leads to a gross appearance of solidification, or consolidation, of the alveolar parenchyma. Red hepatization or consolidation: Vascular congestion persists, with extravasation of red blood cells into alveolar spaces, along with increased numbers of neutrophils and fibrin.Grossly, the lung is heavy and hyperemic. Congestion in the first 24 hours: This stage is characterized histologically by vascular engorgement, intra-alveolar fluid, small numbers of neutrophils, often numerous bacteria.Lobar pneumonia usually has an acute progression.Ĭlassically, the disease has four stages: Stages Micrograph of lobar pneumonia, H&E stain. This leads to consolidation or solidification, which is a term that is used for macroscopic or radiologic appearance of the lungs affected by pneumonia.īacterial pneumonia is mainly classified into lobar and diffuse depending on the degree of lung irritation or damage. This leads to the accumulation of cellular debris within the lungs. The invading organism starts multiplying, thereby releasing toxins that cause inflammation and edema of the lung parenchyma. In children round pneumonia develops instead because the pores of Kohn which allow the lobar spread of infection are underdeveloped. It is one of three anatomic classifications of pneumonia (the other being bronchopneumonia and atypical pneumonia). Lobar pneumonia is a form of pneumonia characterized by inflammatory exudate within the intra-alveolar space resulting in consolidation that affects a large and continuous area of the lobe of a lung. This figure also shows pneumonia affecting the lower lobe of the left lung. Figure A shows the location of the lungs and airways in the body. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |