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 RETROGRADE. 1. : characterized by retrogression. 2. 3. : occurring or performed in a direction opposite to the normal or forward direction of conduction or flow: as.â retÂ·roÂ·gradeÂ·ly adverb. (1) : moving, occurring, or performed in a backward direction (2) : occurring or performed in a direction opposite to the normal or forward direction of conduction or flow â compare anterograde 1 c: contrary to the normal order: inverse. 2. : tending toward or resulting in a worse or previous state.