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.
Retrograde and Anterograde Amnesia. Retrograde amnesia is the loss of memories that formed before a trauma such as brain injury. A person found wandering around in the street, not knowing who he or she is, suffers from retrograde amnesia. By contrast, anterograde amnesia, H.M.'s type, prevents new memories from being formed after a trauma such as brain injury.