π§ Title
Fetal Ventricular Atrium Measurement at 22 Weeks | Normal Lateral Ventricle Case (5.5 mm / 6.4 mm)
π Meta Description
Ultrasound case of fetal lateral ventricular atrium measurement at 22+2 weeks. Both ventricles measured within normal range (Va 5.5 mm, Vp 6.4 mm). Inner-to-inner technique demonstrated.
Introduction
Accurate measurement of the fetal lateral ventricular atrium is essential during the mid-trimester anatomy scan. Ventriculomegaly is typically defined when the atrial width measures β₯10 mm.
This case demonstrates normal ventricular measurements at 22+2 weeks of gestation.
Case Information
- Gestational Age: 22+2 weeks
- Measurement Technique: Inner-to-inner caliper placement
- Va (Left ventricle): 5.5 mm
- Vp (Right ventricle): 6.4 mm
Both measurements are within normal limits (<10 mm).
Ultrasound Findings
The axial plane of the fetal head was obtained at the level of the thalami.
The atrium of the lateral ventricle was measured perpendicular to the long axis of the ventricle, ensuring proper visualization of:
- Cavum septi pellucidi
- Thalami
- Symmetrical hemispheres
No evidence of ventriculomegaly was observed.
Clinical Significance
Normal atrial width ranges between 5β10 mm during the second trimester.
Routine measurement is important for early detection of:
- Mild ventriculomegaly (10β12 mm)
- Moderate ventriculomegaly (13β15 mm)
- Severe ventriculomegaly (>15 mm)
This case represents normal physiologic findings.
Key Learning Points
β Always measure inner-to-inner
β Obtain a true axial transventricular plane
β Avoid oblique measurement
β Confirm symmetry between both ventricles
π
- fetal ventricle measurement
- lateral ventricular atrium
- ventriculomegaly ultrasound
- 22 week anatomy scan
- normal fetal ventricle size