Lemon sign

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[edit] Discussion of Lemon sign

  • The lemon sign is a marker for open spina bifida, being seen in 98% of cases
  • The lemon sign refers to an abnormally shaped fetal head seen at antenatal US performed during the second trimester.
  • The cranial vault appears lemon-shaped in axial cross section because the frontal bones are flattened or concave.

Lemon sign is an indentation of the frontal bones as seen on US imaging

[edit] Imaging Findings for Lemon sign

[edit] Images

Patient #1

[edit] See Also

[edit] External Links

[edit] References for Lemon sign