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FIG 1. 23-year-old man with progressive headaches.
A, CT scan obtained through the midcranial skull base in the axial plane shows a transsphenoidal encephalocele (black arrows) and complete absence of the right carotid canal. The left carotid canal can be seen (white arrow).
B, Cerebral MR imaging. Sagittal spin-echo T1-weighted sequence, 480/14/4 (TR/TE/excitations), shows a transsphenoidal encephalocele (open arrows). The bone defect involves the basipresphenoid, leaving intact the basipostsphenoid (black arrow). Atrophied optic chiasm pulled down into the bone defect can be seen (curved arrow). Unidentifiable adenohypophysis with ectopic neurohypophysis are shown (straight white arrow).
C, Angiogram of the right common carotid artery. Lateral view shows filling of the right external carotid artery alone.
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