Table 1.

Characteristics of Study Subjects (N = 25).

Characteristic
Age
Median age at diagnosis	6 years (range: 4 mo–16 y)
Gender
Male	13
Female	12
Tumor location
Nontectal midbrain	6
Pontine	3
Pontomedullary	7
Medullary	3
Cervicomedullary	6
Histology	23/25
Pilocytic astrocytoma	16 (64%)
WHO Grade II astrocytoma	3 (12%)
Ganglioglioma	2 (8%)
Mixed oligoastrocytoma	2 (8%)
Diagnosis by MRI only	2/25 (8%)
Presenting features
Headache	12 (48%)
Vomiting	11 (44%)
Hydrocephalus	14 (56%)
Cranial nerve or extremity paresis	16 (64%)
(Including dysphagia)
Failure-to-thrive	5 (20%)
Central sleep apnea	1 (4%)