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
 Imaging Findings for Lemon sign
 See Also
 External Links
 References for Lemon sign
- Clare J. Roche, David P. O’Keeffe, W. Kit Lee, Vinay A. Duddalwar, William C. Torreggiani, and John M. Curtis. Selections from the Buffet of Food Signs in Radiology. RadioGraphics 2002 22: 1369-1384.