What is the difference between synpneumonic effusion and simple parapneumonic effusion? Is it the same?

Synpneumonic effusion and simple parapneumonic effusion are different types of pleural effusions that can occur as a complication of pneumonia.

A parapneumonic effusion is an accumulation of fluid in the pleural space (the space between the lungs and the chest wall) that occurs as a result of pneumonia. It can be simple or complicated. A simple parapneumonic effusion is a sterile fluid collection that occurs as a result of inflammation in the lung adjacent to the pleura, while a complicated parapneumonic effusion is one that becomes infected, which can lead to the formation of an empyema.

A synpneumonic effusion, on the other hand, is a more severe type of parapneumonic effusion that occurs in the setting of a severe pneumonia. It is usually associated with a more severe clinical picture, with symptoms such as high fever, severe chest pain, and respiratory distress. Synpneumonic effusions are usually larger and more complicated than simple parapneumonic effusions, and they require prompt recognition and treatment to prevent complications such as empyema and lung abscess.

In summary, while both synpneumonic and simple parapneumonic effusions can occur as complications of pneumonia and involve fluid accumulation in the pleural space, synpneumonic effusions are generally more severe and complicated, and are associated with a more severe clinical picture.