Listeriosis MRI

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: João André Alves Silva, M.D. [2]

Overview

Brain MRI may be helpful in the diagnosis of Listeria monocytogenes brain lesions. Findings on MRI suggestive of listeriosis include lesions in the cerebellum, brainstem, and cortex. High-signal lesions on T2-weighted images and enhancing lesions on T1-weighted images can be identified in the cerebral parenchyma on MRI following administration of IV contrast. With a high pre-test probability, brainstem involvement on MRI is strongly suggestive of listeriosis. Contrast MRI is recommended among all patients presenting with listerial meningitis, listerial bacteremia, suggestive CNS signs and symptoms or upon suspicion of intracranial listeriosis.

MRI

• Brain MRI may be helpful in the diagnosis of Listeria monocytogenes brain lesions. Findings on MRI suggestive of listeriosis include lesions in the cerebellum, brainstem, and cortex.
• High-signal lesions on T2-weighted MRI images and enhancing lesions on T1-weighted MRI images can be identified in the cerebral parenchyma following administration of IV contrast.
• With a high pre-test probability, brainstem involvement on MRI is strongly suggestive of listeriosis.
• Since brainstem involvement on MRI is strongly suggestive of listeriosis, contrast MRI is recommended among all patients presenting with listerial meningitis, listerial bacteremia, suggestive CNS signs and symptoms or upon suspicion of intracranial listeriosis.