Trigonocephaly-bifid nose-acral anomalies syndrome

Trigonocephaly-bifid nose-acral anomalies syndrome (also known as Trigonocephaly syndrome, Say-Meyer type or Say-Meyer syndrome) is an extremely rare congenital malformation syndrome characterized by a distinctive combination of craniofacial and limb abnormalities. The condition is named for its three cardinal features: trigonocephaly (a triangular-shaped forehead caused by premature fusion of the metopic suture of the skull), a bifid nose (the nose appears split or notched at its tip), and acral anomalies (abnormalities of the hands and feet, including brachydactyly, syndactyly, or other digital malformations). Additional features may include intellectual disability, short stature, and other craniofacial dysmorphisms. The syndrome primarily affects the skeletal system (particularly the skull and extremities), the craniofacial structures, and potentially the central nervous system. Because of the premature cranial suture fusion, some affected individuals may experience increased intracranial pressure or developmental delays. The condition is present from birth, with the craniosynostosis and facial features typically apparent in the neonatal period. There is no specific cure or targeted therapy for this syndrome. Management is supportive and symptomatic, often involving a multidisciplinary team. Surgical correction of craniosynostosis may be necessary to relieve intracranial pressure and improve skull shape. Reconstructive surgery may be considered for the bifid nose and hand or foot anomalies. Developmental support and early intervention services are recommended for children with intellectual disability or developmental delays. Given the extreme rarity of this condition, only a handful of cases have been described in the medical literature, and long-term outcomes remain poorly characterized.

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