Halo
Halo (Medical Term)
Halo (/ˈheɪloʊ/; from Greek: ἅλως, halōs) is a term used in various fields of medicine to describe a ring-like or circular structure. The term is derived from the Greek word halos, which means a disk or a ring of light around the sun or moon.
Etymology
The term "halo" comes from the Greek word halos, which originally referred to a disk or ring of light around the sun or moon. In the medical context, it is used to describe a similar ring-like or circular structure, often seen in medical imaging or in the presentation of certain symptoms.
Usage in Medicine
In medicine, the term "halo" is used in various contexts:
- Halo sign: In radiology, a halo sign refers to a ring of ground-glass opacity surrounding a nodule or mass in the lung, often seen in invasive aspergillosis.
- Halo nevus: A halo nevus (also known as Sutton's nevus or leukoderma acquisitum centrifugum) is a mole that is surrounded by a ring of depigmented skin.
- Halo effect: In ophthalmology, a halo effect refers to the perception of halos around lights, often experienced by patients with cataracts or those who have undergone refractive surgery.
Related Terms
- Ring-enhancement: In radiology, ring-enhancement refers to a specific pattern of contrast enhancement where a lesion enhances in a ring-like or circular manner, similar to a halo.
- Corona radiata: In neuroanatomy, the corona radiata is a white matter sheet that continues ventrally as the internal capsule and dorsally as the centrum semiovale. This is often referred to as a "halo" due to its circular shape around the lateral ventricles.
External links
- Medical encyclopedia article on Halo
- Wikipedia's article - Halo
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