Halo
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[edit | edit source]
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[edit | edit source]
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[edit | edit source]
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[edit | edit source]
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Contributors: Prab R. Tumpati, MD
