Leptocephaly
Leptocephaly is a rare form of complex craniosynostosis in which the sagittal and metopic suture simultaneously close. Leptocephaly is characterized by equal narrowing of the head and a tall and narrow head shape. Leptocephaly is usually nonsyndromic, but has been seen in individual cases such as Neu-Laxova syndrome.
The term leptocephaly has also been used to refer to microcephaly.