Preferred Label : lemon sign;
Definition : Abnormally flat or concave frontal bones give fetal skull a lemon shape on transverse
sonograms. Most commonly associated with spina bifida and several other developmental
abnormalities. Seen before 24 weeks gestational age.;
Source : Radiology 2003; 228:206-207;
Origin ID : RID35342;
Associated condition(s)
- Currated CISMeF NLP mapping
Abnormally flat or concave frontal bones give fetal skull a lemon shape on transverse
sonograms. Most commonly associated with spina bifida and several other developmental
abnormalities. Seen before 24 weeks gestational age.
