Trigonocephaly

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What Wikipedia says

Trigonocephaly is a congenital condition due to premature fusion of the metopic suture (from Ancient Greek metopon 'forehead'), leading to a triangular forehead. The premature merging of the two frontal bones leads to transverse growth restriction and parallel growth expansion.

Excerpt from the Wikipedia article “Trigonocephaly”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Mikael Häggström, Public domain, via Wikimedia Commons.