Table III.

Participant Characteristics: Age, Sex, OFC Percentile, Height Percentile, Reviewed MRI/CT Findings, and History of Seizures

#	Age	Sex	OFC%	Ht%	Reviewed MRI Findings				Seizures
					Cerebellar Vermis	Ventricles	White Matter	Other
1	1.3	f	50	50	normal	moderate dilation	thin white matter, thin CC, increased T2 signal	small midbrain and pons	no
39	2.2	f	>98	55	hypoplasia	mild dilation	NAa	increased extra-axial space	no
4	3.9	f	>98	95	normal	asymmetric, mild dilation	normal	large posterior fossa with increased extra-axial space	no
5	4.0	m	>98	75	hypoplasia	mild dilation	thin CC, thin white matter, increased T2 signal occipital lobes	prominent extra axial spaces, posterior fossa cyst	yes
56	4.3	m	>98	90	mild hypoplasia	moderate dilation	rounded CC, thin white matter	Increased extra-axial space	yes
9	4.6	m	35	15	hypoplasia	shunted hydrocephalus	collapsed CC (secondary to shunt)	large frontal lobes, small pons, increased extra-axial space posterior fossa	yes
12	5.3	m	50	35	normal	normal	increased T2 signal occipital lobes	increased extra-axial space posterior fossa	yes
13	5.6	f	95	90	mild hypoplasia	asymmetric, mild dilation	increased T2 signal, thin white matter, rounded CC	increased extra-axial fluid	no
15	5.9	f	>98	5	normal	moderate dilationb	increased T2 signal, thin rounded CC, thin white matter	cerebellar tonsil ectopia, increased extra-axial space	no
17	6.8	f	45	15	mild anterior atrophy	normal	increased T2 signal frontal lobes	cavum septum pellucidum	no
22	7.9	m	60	10	normal	Mild asymmetry lateral ventricles	mildly thin white matter		no
23	9.7	f	>98	95	normal	mild dilation	Immature white matter, increased perivascular space	increased extra-axial space	yes
26	10.9	m	>98	5	mild hypoplasia	asymmetric, mild dilation	normal	posterior fossa cyst	no
27	11.0	f	80	70	mild anterior atrophy	mild dilation	mildly thin posterior white matter		no
29	12.2	m	45	20	hypoplasia	mild dilation	thin CC, thin white matter	Posterior fossa cyst	no
30	13.7	f	>98	95	small, mild atrophy, prominent folia	mild dilation	increased T2 signal frontal, parietal, occipital lobes		no

Abbreviations: OFC% = head circumference percentile; Ht% = height percentile; CC = corpus callosum

^aOnly CT scan available for review.

^bMRI done at age 17 months. At 18 months had VP shunt placed for hydrocephalus.