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Figures
- Fig 1.
The Guillain-Mollaret triangle and dentatorubrothalamocortical projections.
- Fig 2.
Transverse proton attenuation–weighted images illustrating the MR imaging appearance of normal IONs (A, white arrows) and unilateral (B, black arrow) and bilateral (C, black arrows) HOD in patients approximately 4 months after surgery for midline posterior fossa tumors. Note that with this imaging technique, normal IONs (white arrows) are barely recognizable, but in abnormal conditions, their conspicuity is markedly increased, allowing confident identification of HOD in most cases.
- Fig 3.
Transverse proton attenuation–weighted images showing chronologic changes (increasing conspicuity) within the bilateral inferior olivary nuclei (white arrowheads) in a patient with PFS during the first year after surgery. A, Preoperative study. B, At 1-month follow-up. C, At 6-month follow-up. D, At 10-month follow-up.
Tables
Clinical features of patients with and without posterior fossa syndrome
Variable PFS (n = 12) Non-PFS (n = 12) Mutism >24 hours 12 0 Immediate postoperative Mild-to-moderate dysmetria 7 2 Severe dysmetria 5 0 Mild-to-moderate ataxia 0 7 Severe ataxia 12 2 At last follow-upa Mild-to-moderate dysmetria 2 0 Severe dysmetria 1 0 Mild-to-moderate ataxia 7 5 Severe ataxia 5 1 Note:—Dysmetria: incoordination of limbs with either some (i.e., mild to moderate) or complete (i.e., severe) impairment of function. Ataxia: impaired ability to sit and walk with independent mobility retained (mild to moderate) or with mobility assistance required (severe).
↵a Time to last follow-up evaluation: 3–99 months.
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