Which deep brain structure is typically observed as a hypoechoic ovoid in the midline of the fetal brain and lies between the cerebral hemispheres?

Which deep brain structure is typically observed as a hypoechoic ovoid in the midline of the fetal brain and lies between the cerebral hemispheres?

• A. Thalamus
• B. Cerebellum
• C. Hypothalamus
• D. Pituitary

Answer: (A)

In fetal brain ultrasound, the deep midline structure between the cerebral hemispheres that appears as a hypoechoic ovoid is the thalamus. It sits in the diencephalon and lies adjacent to the third ventricle, centralized between the two hemispheres. This central, oval appearance is characteristic for the thalamus in the midline view. The cerebellum resides in the posterior fossa, well away from the midline between the hemispheres. The hypothalamus is also a midline structure but is not typically identified as a distinct hypoechoic ovoid in this common fetal imaging view. The pituitary sits at the base of the brain in the sella and is not the midline structure between the cerebral hemispheres in standard fetal scans.

In fetal brain ultrasound, the deep midline structure between the cerebral hemispheres that appears as a hypoechoic ovoid is the thalamus. It sits in the diencephalon and lies adjacent to the third ventricle, centralized between the two hemispheres. This central, oval appearance is characteristic for the thalamus in the midline view.

The cerebellum resides in the posterior fossa, well away from the midline between the hemispheres. The hypothalamus is also a midline structure but is not typically identified as a distinct hypoechoic ovoid in this common fetal imaging view. The pituitary sits at the base of the brain in the sella and is not the midline structure between the cerebral hemispheres in standard fetal scans.