Ring-enhancing lesion

MRI showing a ring-enhancing lesion in the brain of a patient with glioblastoma multiforme

A ring-enhancing lesion is an abnormal radiologic sign on MRI or CT scans obtained using radiocontrast. On the image, there is an area of decreased density (see radiodensity) surrounded by a bright rim from concentration of the enhancing contrast dye. This can be a finding in numerous disease states. In the brain, it can occur with an early brain abscess as well as in Nocardia infections associated with lung cavitary lesions. In patients with HIV, the major differential is between CNS lymphoma and CNS toxoplasmosis, with CT imaging being the appropriate next step to differentiate between the two conditions.^[1]

References

↑ Fauci A. Harrison's Principles of Internal Medicine, New York, McGraw Hill Medical, 2008

External links

Ring Enhancement: The Free Medical Dictionary

Radiologic signs

Cardiovascular	Aortic unfolding Dense artery sign Halo sign

Respiratory	Air crescent sign Deep sulcus sign Golden S sign Hampton hump Kerley lines Peribronchial cuffing Sail sign of the chest Silhouette sign Steeple sign Thumbprint sign Traction bronchiectasis Tree-in-bud sign Westermark sign

Urogenital	Canga's bead symptom

Musculoskeletal	Crescent sign Fabella sign Fat pad sign Osteopathia striata Sail sign of the elbow

Gastrointestinal	Cupola sign Double bubble Endoexoenteric Football sign Hampton's line Hot quadrate sign Mumoli's sign Omental cake Pneumatosis intestinalis Rigler's sign Sentinel loop

Neurological	Hot cross buns Hyperdense middle cerebral artery

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