Fig 1.

Representative MR images show an edema along the OT in a 33-year-old woman with craniopharyngioma (reproduced from reference 8 with the permission of the ©American Society of Neuroradiology).

A, T1-weighted contrast-enhanced coronal MR image before treatment. High- and low-signal-intensity mass (arrowhead) is visible at the suprasellar cistern. Low-signal-intensity edema (arrow) is noted along the left OT.

B, Heavily T2-weighted coronal MR image before treatment shows bilateral edemas (thick arrows) along the OT. The left side is more prominent. The OTs are difficult to differentiate from the edemas. On the right side, a curvilinear area of high signal intensity (thin arrow) originates from the edema.

C, On this heavily T2-weighted coronal MR image obtained 3 months after surgery (similar level as in B), the edema disappears on the right side. A large PV space (left thick arrow), present in normal conditions, is visible along the right OT (thin arrow). Edema (right thick arrow) remains on the left side.