Lemon Sign

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Lemon Sign

An ultrasound finding seen when a major neural tube defect accompanies Arnold-Chiari malformation, with herniation of cerebellar tonsils and midbrain structures into the foramen magnum, causing ventriculomegaly due to compression of outflow from the 3rd and 4th ventricles; downward traction of the brain causes a reduction in the anterior calvarium, resulting in a triangular-shaped head in the biparietal diameter, fancifully likened to a lemon

lemon sign

Obstetrics An ultrasound finding seen when a major neural tube defect accompanies Arnold-Chiari malformation, with herniation of cerebellar tonsils and midbrain structures into the foramen magnum, causing ventriculomegaly due to compression of outflow from the 3^rd and 4^th ventricles; downward traction of the brain causes a reduction in the anterior calvarium, resulting in a triangular-shaped head in the biparietal diameter, fancifully likened to a lemon

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