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The Etiology of Ring Lesions on Diffusion-Weighted Imaging
NeuroRadiol J 27:280-287, Finelli, P. & Foxman, E.B., 2014
See this aricle in Pubmed

Article Abstract
Thirty-one cases, including 15 new patients, comprise the study group. Immunocompromised patients accounted for 38% of patients with ring lesions on diffusion-weighted imaging with cerebral aspergillosis in five patients, progressive multifocal leukoencephalopathy in three, primary CNS lymphoma in two, cerebral toxoplasmosis in one, and resolving cerebral hematoma in one. In the immunocompetent group demyelinating lesions including multiple sclerosis, acute disseminated encephalomyelitis, Balos concentric sclerosis and acute necrotizing encephalitis, were seen in 11 patients, vascular etiology in four and neoplastic in three patients, two primary and one metastatic and pyogenic brain abscess in one. Ring lesions on diffusion-weighted imaging are associated with a spectrum of disease not previously considered. Immunocompromised patients accounted for almost one-half while demyelinating conditions in the immunocompetent patients were most common overall.
 
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abscess,intracerebral
acute necrotizing encephalitis
central nervous system,infection of
cerebrovascular accident
concentric sclerosis
immunocompetent
immunosuppression
intracerebral hemorrhage
lymphoma,primary of CNS
MRI,abnormal
MRI,diffusion weighted
MRI,ring sign
MRI,ring sign,open
multiple sclerosis
progressive multifocal leucoencephalopathy
toxoplasmosis,CNS

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