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An abnormal shape of the skull with a triangular forehead and a premature closure of the metopic suture is suggestive of trigonocephaly, a rare form of craniostenosis that is frequently associated with other anomalies

Reference(s):Chaoui R, Levaillant JM, Benoit B, Faro C, Wegrzyn P, Nicolaides KH. Three-dimensional sonographic description of abnormal metopic suture in second- and third-trimester fetuses. Ultrasound Obstet Gynecol 2005;26(7):761–4. PubMed PMID: 16308900.