PMC9928449_01
Hess chart showing restricted right eye lateral rectus motility and left eye medial rectus over-action.
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A Hess chart confirmed this restriction (Figure 1).
Heavily T2-weighted axial magnetic resonance image showing a persistent trigeminal artery on the right side of prepontine cistern indenting the ventral surface of the right side of the pons (arrow) at the site of the exit of the right abducens nerve.
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T2-weighted MRI sequence, a prominent arterial structure communicating between the basilar artery and the right cavernous internal carotid artery was demonstrated, suggestive of a PTA (Figure 2). This indented the ventral surface of the pons at the exit location of abducens nerve and was felt to be causing compression of the abducens nerve at that point.