Hamburger sign

Hamburger sign is a term used in medical imaging and obstetrics to describe the appearance of a female fetus' external genitalia on an ultrasound scan. This sign is typically observed during the second trimester of pregnancy, and is indicative of female gender.

Overview

The term "hamburger sign" is derived from the appearance of the female fetal genitalia on an ultrasound scan, which resembles a hamburger. This is due to the three parallel lines that represent the labia and clitoris. The two outer lines represent the labia, while the inner line represents the clitoris. This sign is usually visible from the 16th week of pregnancy onwards.

Significance

The hamburger sign is significant in prenatal diagnosis as it helps in determining the sex of the fetus. It is one of the most reliable signs of female gender in prenatal ultrasound. However, it is important to note that the accuracy of gender determination via ultrasound depends on several factors including the gestational age, the position of the fetus, and the skill and experience of the sonographer.

See also

• Turtle sign
• Prenatal diagnosis
• Ultrasound