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.
Retrolisthesis. is the term used to define a degenerative and an acute spine condition in which a single vertebra gets displaced and moves backwards onto the vertebra lying immediately below it.Vertebrae are the bones that make up the spinal column and are separated from each other by cushioning intervertebral discs.ymptoms of Retrolisthesis. include stiffness in the affected area, chronic back pain that may extend to buttocks and thighs or no pain and numbness. This condition may also narrow down the spinal canal size leading to irritation of the spinal nerves.