ring enhancement

ring en·hance·ment

in computed tomography, when a bright circle appears on an image made after injection of contrast medium, characteristic of localization of the contrast in the wall of an abscess.
A CT finding in the brain consisting of a radiolucent zone surrounded by a faint radiodense rim, in turn surrounded by a 2nd radiolucent zone outside of the rim, where the rings correspond to regional oedema, hypervascularity and hypercellularity with early ingrowth of fibroblasts. Ring enhancement is a nonspecific finding typically linked to early cerebral abscesses
DiffDx Infections—pyogenic abscess, toxoplasmosis, cysticercosis, necrotising fungal lesions; neoplasms—brain tumours—e.g., aggressive glial tumours, cystic astrocytoma, primary brain lymphoma, metastases with central necrosis; demyelinating disease; vascular lesions—resolving infarction, hematoma, thrombosed giant aneurysm; radiation therapy; postoperative changes; IV contrast material may be used to enhance faint radiodense ‘rings’

ring enhancement

Imaging A CT finding in the brain consisting of a radiolucent zone surrounded by a faint radiodense rim, in turn is surrounded by a 2nd radiolucent zone outside of the rim, where the rings correspond to regional edema, hypervascularity and hypercellularity with early ingrowth of fibroblasts; RE is a nonspecific finding typically linked to early cerebral abscesses DIffDx Brain tumors–eg, cystic astrocytoma, or metastases with central necrosis; IV contrast material may be used to enhance faint radiodense 'rings'
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Brain magnetic resonance imaging results indicated 3 lesions with high intensity on T2-weighted images and irregular ring enhancement. The lesions were in the right frontal lobe (diameter 15.6 mm), left globus pallidus (diameter 17.5 mm), and body of the caudate nucleus extending to the left thalamus (diameter 16.2 mm; Figure, panel A).
Tumefactive demyelinating lesions are characterized as mass-like lesions with or without ring enhancement on contrast-enhanced MRI.
Ring enhancement was predictive of benign lesions, whereas heterogeneous enhancement was helpful for detecting malignant lesion.
The results suggested that ring enhancement was a predictor of benign lesions, whereas heterogeneous enhancement was a useful indicator of malignant lesions.
Contrast enhanced T1-weighted images showed ring enhancement in solid component and peripheral wall (Figure 1).
Lehman, "Intradural lumbar disk fragment with ring enhancement on MR," American Journal of Neuroradiology (AJNR), vol.
Most lesions showed delayed nodular and incomplete ring enhancement T1-hypointensity or halos were seen in 2 cases.
1), the other lesion was 2.5 cm in diameter and showed clustered ring enhancement. The papillary lesion with atypia that upgraded to DCIS had a linear clustered NME pattern.
CT scan sometimes shows large cysts with ring enhancement causing compression of the adjacent structures and simultaneously the patient is symptomatic.
Fist-like or lumpy enhancement is frequently seen in people with normal immunity; whereas patients with immunodeficiency usually shows ring enhancement.
Ring enhancement is not specific for pyogenic abscess and may be seen in other conditions such as nonpyogenic abscess, high grade neoplasm, primary central nervous system lymphoma, metastasis, infarct, hematoma, thrombosed giant aneurysm, radiation necrosis, demyelinating disease, and Toxoplasmosis gondii infection.
These lesions demonstrated no enhancement to incomplete ring enhancement, with diminished vasogenic oedema (A).