Fig. 1.

(A) Risk factors for the development of posterior fossa syndrome. (B) Methylation tumor subgroups. Much larger representation of Sonic Hedgehog group in the children without posterior fossa syndrome. (C) Distribution of posterior fossa types 1 + 2 among low- and high-volume surgery centers. P value represents Cochran-Armitage exact trend test. (D) MRI comparison of a child with almost normal neurologic examination post tumor resection (left image) and a child who did not regain speech and sitting balance 12 months after tumor resection (right image). Note severe injury to dorsal midbrain and bilateral superior cerebellar peduncles. Both had midline fourth ventricular tumor.