👉 Flat infection, also known as a flat lesion or atypical flat infiltrate, is a type of pneumonia characterized by a diffuse, non-caseating (non-scabrous) area of inflammation in the lungs, often seen on chest X-rays and CT scans. Unlike typical pneumonia, which presents with well-defined, lobar consolidation, flat infections appear as a smooth, flat or slightly elevated area without the characteristic airspace filling seen in more aggressive forms of pneumonia. This condition can be caused by various pathogens, including bacteria, fungi, and viruses, and is often associated with immunocompromised patients, such as those with HIV/AIDS, cancer, or those undergoing immunosuppressive therapy. The flat nature of the infection makes it less likely to cause the intense symptoms and rapid progression seen in other types of pneumonia, but it can still lead to significant respiratory distress if left untreated.
