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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7-cm, oval-shaped fatty mass with peripheral ring enhancement projecting anteriorly from the descending colon (Figure 1).
Those with liquid centre are hypointense on T1W1, the centre is hyperintense on T2W1 but the periphery is hypointense and shows ring enhancement (1).
Enhancing cryptococcomas often do not show restricted diffusion on diffusion-weighted imaging (DWI), (9) low signal intensity on T1-weighted imaging, and low (9) or high intensity (12) on T2 imaging, with uniform or ring enhancement.
It was T2 hyperintense, was slightly hypointense on T1-weighted images, and had subtle ring enhancement without perilesional edema.
Differentiating between pyogenic brain abscesses and centrally necrotic intra-axial tumors can often be challenging radiologically, because both commonly demonstrate ring enhancement and perilesional edema.
The lesions may show nodular homogeneous enhancement or ring enhancement, unless the patient has a very low cellular immunity in which case there may be no enhancement (CD4 cell count <50 cells/[mm.
Contrast enhancement is seen in the majority (Figure 2b) although ring enhancement may be minimal and ill defined if the CD4 cell count is low.
MR imaging showed an ovoid well-circumscribed area of low T1 signal intensity with peripheral ring enhancement and surrounding bone marrow edema (Figures 2 through 3).
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