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.
Free trade in raw materials retrogrades development [edit]. The argument that a country could get locked into serving the needs of the world market in raw materials, and therefore not develop industrially was first advanced by Friedrich List in 1841, and received empirical support in the 20th century.