Trigonocephaly abnormal head shape trigonocephaly 2017-11-08T11:36:27Z triangular skull shape wedge shaped head wedge shaped skull triangular shaped forehead presence of a wedge-shaped, or triangular head, with the apex of the triangle at the midline of the forehead and the base of the triangle at the occiput; trigonocephaly can be caused by premature fusion of the metopic suture MP:0030368 triangular head shape MPheno.ontology triangular cranium shape wedge shaped cranium triangular head