This study aims to provide the cerebellar extrauterine reference value related
to gestational age by analysing the neonatal cerebellum development with
different gestational age, by means of cranial ultrasound. A total of 376
eligible cranial ultrasound images of neonates with gestational age of 25 to 41
weeks were selected. Transverse cerebellar diameter, vermis height, vermis
diameter, vermis circumference, vermis area and vermis eccentricity ratio were
measured and followed by statistical analysis. Transverse cerebellar diameter
formed a linear equation with the gestational age, which was Y = 0.104X + 0.176,
R = 0.735 (P 0.001). Vermis height formed a linear equation with the gestational
age, which was Y = 0.069X - 0.328, R = 0.825 (P 0.001). Vermis diameter formed a
linear equation with the gestational age, which was Y = 0.051X - 0.604, R = 0.749
(P 0.001). Vermis circumference formed a linear equation with the gestational
age, which was Y = 0.284X - 1.709, R = 0.788 (P 0.001). Vermis area formed a linear
equation with the gestational age, which was Y = 0.227X - 4.445, R = 0.82 (P 0.001).
Vermis eccentricity ratio formed a linear equation with the gestational age,
which was Y = -0.01X + 0.909, R = 0.142 (P 0.001). The positive correlation between
vermis height and gestational age was the strongest (r = 0.908, P 0.001). The
results provided that the cerebellar extrauterine reference range, between
transverse cerebellar diameter, vermis height, vermis diameter, vermis
circumference, vermis area, vermis eccentricity ratio of neonates of appropriate
for gestational age. Gestational age is helpful for clinical diagnosis and
evaluation of cerebellum growth and development of newborns.