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Role of imaging the fetal cerebellum and fourth ventricle and their correlation with gestational age.

Authors:Paarthipan N, Chandrika Gurulingappa Teli, Nilesh N. Kate, Suvarna P, Venkateswararao S, Rakesh Bayyavarappu
Int J Biol Med Res. 2012; 3(3): 2088-2092  |  PDF File


Objectives: To examine the ultrasonographic feasibility of imaging the fetal cerebellum and fourth ventricle to correlate with gestational age.Materials & Methods: A cross-sectional, prospective study on 100 healthy fetuses of low-risk pregnancies between 18 and 36 weeks was performed. Biometric measurements were obtained. The fetal head was scanned in the axial plane, fourth ventricle was identified, and its anteroposterior diameter and width were measured. The transfontanel approach, via the abdominal route, was used to evaluate the transverse diameter of cerebellum.Results & conclusion :the anteroposterior and transverse diameter of forth ventricle, transeverse cerebellar diameter of fetus show linear correlation with gestational age , (r=0.969 ,r=0.988, r=0.986 respectively)also with other biometric parameters as BPD- Biparietal diameter, HC- Head circumference, AC -Abdominal circumference, FL- Femoral lemgth. The forth ventricle parameters and transverse cerebellar diameter can be used to correlate with gestational age of the fetus. The results of our study provide normative data for growth of the fetal fourth ventricle for south Indian population. Also these results can be useful for evaluating the fourth ventricle in the fetus since we are providing the percentile values of these parameters. This might be of help in future studies aiming to verify the level of obstruction in cases of prenatal hydrocephaly. More studies are required to know the usefulness of these data in evaluating different developmental anomalies and their prognostic value. no decisions should be based solely on An isolated enlarged fourth ventricle found in the early second trimester. Transvaginal ultrasonography allows a better evaluation of the posterior fossa and therefore is an important tool for a precise diagnosis of posterior fossa malformations. So use of Transvaginal ultrasonography is advised as routine in our part of country.