Limbic encephalitis (Chap. 101) Coronal (A, B), axial fluid-attenuated inversion recovery (FLAIR) (C, D), and axial T2-weighted (E) MR images demonstrate abnormal high signal involving the bilateral mesial temporal lobes (arrowheads) including the hippocampi (left greater than right) without significant mass effect (arrows). There was no enhancement on postgadolinium images (not shown).
CNS tuberculosis (Chap. 165)
Axial T2-weighted MRI (A) demonstrates multiple lesions (arrows) with peripheral high signal and central low signal, located predominantly in the cortex and subcortical white matter, as well as in the basal ganglia.
Axial T1-weighted MR images postgadolinium (B, C) demonstrate ring enhancement of the lesions (arrows) and additional lesions in the subarachnoid space (arrowheads).
Sagittal T2-weighted MR image of the cervical spine (D) demonstrates a hypointense lesion in the subarachnoid space at the level of T5 (arrow).
Sagittal T1-weighted MR image postgadolinium of the cervical spine (E) demonstrates enhancement of the lesion in the subarachnoid space at the level of T5 (arrow).
Neurosyphilis (Chap. 169)
Axial T2-weighted MR images (A, B) demonstrate well-defined areas of abnormal high signal in the basal ganglia bilaterally and in a wedge-shaped distribution in the right parietal lobe (arrows).
Axial (C, D) T1-weighted images postgadolinium.
Coronal (E, F) T1-weighted images postgadolinium demonstrate irregular ring enhancement of the lesions (arrows).
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