A sandal gap deformity is an imaging observation in antenatal ultrasound (typically second trimester) where there is an apparent increase in the interspace between the great toe of the foot from the rest of the toes (likened to the gap caused by a sandal).
While it can be a normal variant (especially when it is the only finding) it is also sometimes considered a soft marker for other fetal anomalies.
Recognised associations include
- Down syndrome 1-3,4
For an unusually wide gap between the 1st and 2nd toe on antenatal ultrasound consider
- 1. Ryu JK, Cho JY, Choi JS. Prenatal sonographic diagnosis of focal musculoskeletal anomalies. Korean J Radiol. 4 (4): 243-51. Korean J Radiol (link) - Free text at pubmed - Pubmed citation
- 2. Article from sonoworld : http://www.sonoworld.com/Client/Fetus/files/aneuploidy_2nd_trimester_skeleton.pdf
- 3. Smith-bindman R, Hosmer W, Feldstein VA et-al. Second-trimester ultrasound to detect fetuses with Down syndrome: a meta-analysis. JAMA. 2001;285 (8): 1044-55. doi:10.1001/jama.285.8.1044 - Pubmed citation
- 4. Devlin L, Morrison PJ. Accuracy of the clinical diagnosis of Down syndrome. Ulster Med J. 2004;73 (1): 4-12. - Free text at pubmed - Pubmed citation
- 5. Guidelines on soft markers from the RCOG : www.rcogcourses.org.uk/topics/soft%20ultrasound%20markers.pdf
Synonyms & Alternative Spellings
|Synonyms or Alternative Spelling||Include in Listings?|
|Sandal gap foot||✗|
|Sandal gap toes||✗|