What is pleural parenchymal scarring in the upper lung?

History: Pleural scarring is using the result of an infection in the past that has healed. It could have been anything from pneumonia to TB to a myriad of other causes. It should be followed by xray or ct scan at intervals to make sure it is not increasing.

Scaring sack: Scar tissue in pleural sac which surrounds the lung from prior infection or trauma.