Trigonocephaly Triangular head shape This shape should be assessed from above, with the examiner looking down on the head of the patient. Trigonocephaly can be caused by premature fusion of the metopic suture. UMLS:C4280666 UMLS:C4280665 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. UMLS:C0265535 Wedge shaped cranium Wedge shaped skull Wedge shaped head Triangular skull shape Triangular cranium shape HP:0000243 SNOMEDCT_US:28740008 Abnormal calvaria morphology