Normal morphometry of fetal posterior fossa at midtrimester: brainstem–tentorium angle and brainstem–vermis angle

Abstract

The BT and BV angle may be of help in assessing the fetal posterior fossa at midgestation and gives a standardized and reproducible measurement of normal tentorium insertion and normal rotation of the cerebellar vermis over the brainstem.

A Case of Enlarged Intracranial Translucency in a Fetus with Blake’s Pouch Cyst

“…However, its biometry was normal [13]. The brainstem-vermis angle and brainstem-tentorium angle was determined by the method of Volpe et al [14] and Ghi et al [15]. Persistent BPC was diagnosed.…”

Diagnosis of a case of Dandy–Walker malformation aided by measurement of the brainstem–vermis angle at 14 weeks gestation

“…These ultrasound findings are very similar, so making a differential diagnosis is challenging, especially during the early gestational stage. Recently, the usefulness of measurement of the brainstem–vermis (B‐V) angle to diagnose congenital anomalies of the posterior cranial fossa has been reported . Here, we report the successful diagnosis of Dandy–Walker malformation aided by measurement of the B‐V angle at 14 weeks of gestation.…”

“…At 14 weeks and 2 days of gestation, ultrasound examination demonstrated ventriculomegaly and cranial posterior fossa fluid collection. The B‐V angle was measured by the same experienced examiner in a sagittal view as has been previously described which has been established as having good intra‐ and interobserver reproducibility. The B‐V angle was found to be 119° upon initial transvaginal ultrasound examination (Fig.…”

The Normal and Pathological Fetal Brain

“…The precise location of the torcula may be more easily determined by measuring brainstem-tentorium (BT) angle as demonstrated in the work performed by the Italian team headed by G. Pilu (Ghi et al 2011 ) (Fig. 7.57 ).…”