Fist-like or lumpy enhancement is frequently seen in people with normal immunity; whereas patients with immunodeficiency usually shows ring enhancement
CT scan sometimes shows large cysts with ring enhancement
causing compression of the adjacent structures and simultaneously the patient is symptomatic.
Gadolinium enhanced T1 images shows 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.
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
Caseating granulomas appear hypo- or isointense on T1 & T2 weighted images and show ring enhancement
after gadolinium contrast with variable degree of perilesional oedema.
white matter lesions with little mass-like effect or vasogenic edema, and post-gadolinium magnetic resonance imaging (MRI) typically showing an incomplete ring enhancement
1) However, MS can present with atypical imaging features consisting of solitary, large (>2 cm)demyelinating plaques with edema, associated mass effect, and/or ring enhancement
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
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.
The radiological classical pictures of TE are multiple parenchymal lesions, with ring enhancement
, which are generally localized at the corticomedullar junction, in the white matter, or the basal ganglia .