PMC3114368_01
Sagittal (a) and axial (b) gadolinium enhanced images. (c) T2-weighted axial image. (d) Coronal gadolinium enhanced image. (e) T2-weighted axial image showing involvement of the optic chiasm. (f) High magnification image from (e) revealing hyperintense signal in the optic chiasm (OC). (g) High magnification image from (d) revealing enhancement within the right optic chiasm (Rt OC)
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F1
Suprachiasmatic and retrochiasmatic components were also evident [Figure 1]. T1, hyperintense on T2, and uniformly enhancing [Figure 1a-c. The optic chiasm appeared significantly enlarged and hyperintense on T2-weighted sequences [Figure 1e and f. Importantly, gadolinium enhancement was evident within the optic chiasm [Figure 1d and g].
Intraoperative image revealing the extent of optic chiasm enlargement from a right lateral suprachiasmatic view. OC - optic chiasm, Lt ON - left optic nerve, Rt ON - right optic nerve, Rt Al - A1 portion of the right anterior cerebral artery
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F2
It was grossly enlarged with an infrachiasmatic growth caudal to the right optic nerve [Figure 2].