The Etiology of Ring Lesions on Diffusion-Weighted Imaging

This study describes a series of cases and reviews the literature on cases of ring lesion on diffusion-weighted imaging to better appreciate the spectrum of disease associated with this neuroimaging finding. We retrospectively reviewed the MR studies of 15 patients with ring pattern lesions on diffu...

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Bibliographic Details
Published in:The neuroradiology journal 2014-06, Vol.27 (3), p.280-287
Main Authors: Finelli, Pasquale F., Foxman, Ethan B.
Format: Article
Language:English
Subjects:
Adult
Aged
Aged, 80 and over
Brain - immunology
Brain - pathology
Demyelinating Diseases - immunology
Demyelinating Diseases - pathology
Diagnosis, Differential
Diffusion Magnetic Resonance Imaging - methods
Encephalitis - immunology
Encephalitis - pathology
Female
Humans
Immunocompromised Host - immunology
Male
Middle Aged
Original
Young Adult
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Summary:This study describes a series of cases and reviews the literature on cases of ring lesion on diffusion-weighted imaging to better appreciate the spectrum of disease associated with this neuroimaging finding. We retrospectively reviewed the MR studies of 15 patients with ring pattern lesions on diffusion-weighted imaging from an inpatient Neurology service of a tertiary care center seen over a ten-year period, and reviewed cases in the literature. 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, Balo's 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.
ISSN:1971-4009
2385-1996
DOI:10.15274/NRJ-2014-10036