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'''Halo''' is a term used in [[medicine]] to describe a circular structure or appearance. It is often used in the context of medical imaging, where a halo may be seen around a lesion or abnormality. The term is derived from the Greek word 'halos', which means 'disk' or 'ring of light'.

== Causes of Halo Appearance in Medical Imaging ==

A halo appearance in medical imaging can be caused by a variety of conditions, including:

* [[Inflammation]]: Inflammatory processes can cause a halo appearance in medical imaging. This is often seen in conditions such as [[rheumatoid arthritis]] and [[sarcoidosis]].
* [[Tumors]]: Certain types of tumors, such as [[lymphomas]], can cause a halo appearance in medical imaging.
* [[Infections]]: Infections, particularly those caused by fungi or bacteria, can cause a halo appearance in medical imaging.

== Halo Sign ==

The halo sign is a specific type of halo appearance seen in medical imaging. It is characterized by a ring of ground-glass opacity surrounding a nodule or mass in the lung. The halo sign is often associated with [[invasive fungal infections]], particularly [[aspergillosis]].

== Halo Phenomenon ==

The halo phenomenon is another specific type of halo appearance seen in medical imaging. It is characterized by a ring of increased uptake surrounding a lesion on a [[positron emission tomography]] (PET) scan. The halo phenomenon is often associated with malignant tumors, particularly [[lymphomas]].

== See Also ==

* [[Ground-glass opacity]]
* [[Nodule (medicine)]]
* [[Positron emission tomography]]

[[Category:Medical terminology]]
[[Category:Radiology]]
[[Category:Oncology]]
[[Category:Infectious diseases]]

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Halo - Revision history

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