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.
permutation A permutation is a change or variation, like the many possible permutations of hair color you get when you start experimenting with different dyes. Permutation is made of the prefix per for thoroughly and mutation, which means âchange.â A permutation is a thorough change of something, like a substitution. Asking a waiter to give you sweet potato fries instead of regular fries is a permutation. Switching hats with a friend is a permutation.