Of the common causes for exudative pleural effusions, parapneumonic effusions have the highest diagnostic priority. Even in the face of antibiotic therapy, infected pleural effusions can rapidly coagulate and organize to form fibrous peels that might require surgical decortication.
Retrogradation is the landward change in position of the front of a river delta with time.etrogradation is the landward change in position of the front of a river delta with time.
As you might guess, retrogress is the opposite of progress. Retrogression is usually an undesirable decline from a higher or advanced level. So, for instance, in difficult social situations an adolescent can retrogress to a childish level of maturity.