focal
Meaning of focal: Focal describes a finding, change, or process confined to one specific location rather than spread throughout an organ or tissue.
Definition of focal
Focal describes something that is limited to one specific location rather than being spread throughout an organ, tissue, or the body as a whole. The word is used across many areas of medicine to describe a finding on imaging, a symptom, or a disease process that has a defined, localized point of origin.
A focal finding is often contrasted with a diffuse or generalized one, which involves a broader area or an entire organ rather than a single confined spot. A focal seizure, for example, begins in one specific area of the brain, and a focal liver lesion refers to an abnormality identified at one particular site within the liver rather than throughout the organ.
Describing a finding as focal helps convey its extent and can influence how it is further evaluated.
Used in a sentence
Imaging identified a focal lesion within the right lobe of the liver.
Good to know
Focal and diffuse describe opposite patterns of extent: a focal process is confined to one area while a diffuse process involves a broader or generalized distribution, and this distinction often guides further evaluation.