1], The nerve fibers in the pons are concentrated and complex, particularly in the basis pontis.
In the case group, MRI revealed that all of the primary infarctions were located above MCPs and extended to the basis pontis, with left in 12 cases (40.
The site of the lesion is usually in the basis pontis
and there may be variable involvement of the pontine tegmentum, medulla and midbrain.
Brain magnetic resonance imaging (MRI), on admission [Figure 1], revealed a high signal intensity lesion involving basis pontis and medulla oblongata on both the T2-weighted image [Figure 1]b and fluid attenuation inversion recovery (FLAIR) [Figure 1]d.
We speculate the possible mechanism of VZV spreading to CNS is the reactivated viruses, which establish latency in geniculate ganglia, upward thread porus acusticus internus along with facial canal, and eventually enter intracranially and firstly invade basis pontis.
The typical location of CPM is center of dorsal basis pontis
and displays a round or oval shape on axial MR sections in acute CPM or a triangular shape in chronic or subacute CPM.