Table 1.

Diagnostic criteria of FND

Anterior cranium bifidum occultum

V-shaped or widow's peak of frontal hairline

True ocular hypertelorism (IP distance >97th centile)

Broadening of nasal root

Lack of nasal tip formation

Median facial cleft (nose and/or upper lip and palate)

Unilateral or bilateral clefting of the alae nasi

At least 2 of these features are required to make a diagnosis. Established from Sedano and Gorlin [1988].