What does atelectasis refer to?

Atelectasis refers specifically to a condition where there is a collapse or complete or partial airlessness of the lung. This can occur when the air sacs (alveoli) in the lung become deflated or filled with fluid, leading to reduced gas exchange and difficulty in breathing. It's important to recognize that atelectasis can result from various causes such as blockages, pressure from outside the lung, or insufficient surfactant, but the defining feature is the state of the lung being collapsed or lacking air. This term is widely used in medical contexts to describe lung functionality and issues related to respiratory health.