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The Transthalamic Plane (TTP)

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This specialized session explores the transthalamic plane, a crucial axial view in neurosonography. Students will learn to identify key landmarks like the thalami and cavum septi pellucidi (CSP) to ensure the correct plane is obtained for accurate BPD and HC measurements.

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1. Which of the following anatomical structures must be visible in a correctly obtained transthalamic plane?
Thalami, cavum septi pellucidi (CSP), third ventricle Cerebellum, cisterna magna, fourth ventricle Lateral ventricles, choroid plexus, foramen of Monro Corpus callosum, brainstem, cerebellar vermis
2. The biparietal diameter (BPD) is measured in which ultrasound plane?
Transventricular plane Transthalamic plane Transcerebellar plane Transfontanelle plane
3. Why is the cavum septi pellucidi (CSP) an important landmark in the transthalamic plane?
Its presence confirms normal brain midline development It is a marker of fetal head position It is used to calculate gestational age It helps evaluate cerebellar growth
4. A distorted transthalamic plane with an absent CSP could indicate which condition?
Dandy-Walker malformation Agenesis of the corpus callosum Arnold-Chiari malformation Holoprosencephaly
5. Which biometric parameters are typically measured in the transthalamic plane?
BPD and HC Cerebellar diameter and cisterna magna Ventricular width and choroid plexus size Nuchal fold thickness and nasal bone length
6. At what gestational age does the cavum septi pellucidi typically close, making it no longer visible on ultrasound?
12–16 weeks 18–22 weeks 24–32 weeks After birth
7. Which of the following is a common mistake when obtaining the transthalamic plane?
Measuring the BPD at an oblique angle Including the orbits in the image Failing to visualize the thalami symmetrically All of the above