Table 2.

Correlation between areas of vermis and brainstem regions evaluated quantitatively on magnetic resonance imaging and number of differentiable vermian lobules in fetuses with cystic posterior fossa malformations, according to group defined by standard criteria (vermian size and brainstem–vermis (BV) angle), and in brain‐normal controls

Region	Controls (n = 148)		Group 1 (n = 74)		Group 2 (n = 24)		Group 3 (n = 44)
	r	P	r	P	r	P	r	P
Vermis	0.596	< 0.001	0.499	< 0.001	0.669	< 0.001	0.464	0.002
Mesencephalon	0.623	< 0.001	0.437	< 0.001	0.524	0.009	0.164	0.288
Pons	0.614	< 0.001	0.508	< 0.001	0.716	< 0.001	0.223	0.146
Medulla oblongata	0.635	< 0.001	0.479	< 0.001	0.615	0.001	0.226	0.141

Groups defined as follows: normal vermian area and BV angle < 25° (Group 1); reduced vermian area and/or BV angle of 25–45° (Group 2); reduced vermian area and BV angle > 45° (Group 3; Dandy–Walker malformation group).

r, Pearson's correlation coefficient.