Trigonocephaly 2, also known as trigno2, is related to non-syndromic metopic craniosynostosis and non-syndromic bicoronal and metopic craniosynostosis. An important gene associated with Trigonocephaly 2 is FREM1 (FRAS1 Related Extracellular Matrix 1). Affiliated tissues include bone and brain, and related phenotypes are hypertelorism and trigonocephaly