View source for 34. Phthisis cavernosa

'''Organ''': Lung

'''Description''':

The pleura is thickened and whitish. There is a large cavity in place of the parenchyme. There is also anthracosis of the lymph nodes.[[File:Phthisis cavernosa prep.jpg|thumb|Phthisis cavernosa prep]]'''Diagnosis''': Phthisis cavernosa/pulmonis

'''Causes''':

* Post-primary tuberculosis
** Exogenous re-infection after a primary tuberculosis

'''Theory''':

Some years after a primary tuberculosis infection can the patient get re-infected by m. tuberculosis from the outside. This activates another “case” of tuberculosis in the patient, called ''post-primary tuberculosis by exogenous re-infection''.

The re-infection will affect the lungs. It will necrotize the parenchyme, starting at the apex, producing a type of cavity called a ''secondary'' cavity. The necrosis is of caseating type. After the apex parenchyme has been destroyed will the infection gradually descend toward the base of the lung, destroying the parenchyme on its way. This descending process is called ''Assman infiltration''. The result of this parenchymal destroying is the formation of cavities, forming the phthisis cavernosa we see here.

The thickening of the pleura is due to pleural fibrosis. Pleural fibrosis is part of the healing process of tuberculosis. The anthracosis is unrelated to the tuberculosis.
[[Category:Pathology 1 - Macropreparations]]