Halo sign
Halo sign
The Halo sign (pronunciation: /ˈheɪ.loʊ sʌɪn/) is a medical term used in radiology to describe a specific appearance on imaging studies, often associated with certain pathological conditions.
Etymology
The term "Halo sign" is derived from the Greek word 'halos', which means 'disk of light around the sun or moon'. In medical context, it refers to a circular radiolucent area surrounding a radiopaque mass on imaging studies.
Definition
The Halo sign is a radiographic feature seen on Computed Tomography (CT) scans or Magnetic Resonance Imaging (MRI) of the chest. It is characterized by a ground-glass opacity surrounding a nodule or mass, giving the appearance of a halo.
Clinical Significance
The Halo sign is often associated with certain diseases such as Invasive Pulmonary Aspergillosis, Cryptococcosis, and other fungal infections. It can also be seen in patients with Lung Cancer or Lymphoma. The presence of a Halo sign can help in the early diagnosis and treatment of these conditions.
Related Terms
- Ground-glass opacity
- Nodule
- Mass
- Invasive Pulmonary Aspergillosis
- Cryptococcosis
- Lung Cancer
- Lymphoma
See Also
External links
- Medical encyclopedia article on Halo sign
- Wikipedia's article - Halo sign
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