What Is Pulmonary Infiltation and Atelectasis of the Left Lower Lobe?

An infiltrate of the lower left lobe refers to pulmonary edema, which is the filling of fluid in the lobe or filling by any other substance such as cells (tumors) and inflammatory emissions; whereas an atelectasis of the left lower lobe refers to its collapse, either complete or partial. The visual impression of the atelectasis alone makes it impossible to distinguish from an infiltrate.