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.
Medical Definition of retrogression. : a reversal in development or condition: asa: return to a former and less complex level of development or organizationb: subsidence or decline of symptoms or manifestations of a disease.