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Optic chiasmal edema observed on T2-weighted MR images: a reversible finding in obstructive hydrocephalus
Takashi Hiyama1, Tomohiko Masumoto, Masanari Shiigai
1Department of Radiology, University of Tsukuba Hospital, 2-1-1 Amakubo, Tsukuba, Ibaraki, 305-0005, Japan, med-tak@hotmail.com.
Purpose:
To evaluate the clinical significance of optic chiasmal edema (OCE) observed in hydrocephalus.
Materials And Methods:
Twenty patients with obstructive hydrocephalus and eight patients with communicating hydrocephalus were recruited. We classified both groups into OCE-positive and negative subgroups on three-dimensional T2-weighted images. In the obstructive hydrocephalus group, the pre- and postoperative periventricular hyperintensity (PVH) grade, Evans index, and third ventricle diameter were compared between the subgroups. The visual disturbances were reviewed in the medical records.
Results:
Eleven obstructive hydrocephalus patients (55 %) had OCE, while none of communicating hydrocephalus patients did. OCE was improved in all patients postoperatively. Preoperative PVH grade was significantly higher in the OCE-positive subgroup (p < 0.01). There were no statistically significant differences in the other indices. Visual disturbances were observed in two OCE-negative patients alone.
Conclusion:
OCE is a reversible finding frequently observed in obstructive hydrocephalus and may not be associated with visual disturbances.
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