Title: Aortic Arch Anomaly-Peculiar Facies-Intellectual Disability

Overview: Aortic arch anomaly-peculiar facies-intellectual disability is an extremely rare congenital syndrome. It was described in a small number of relatives and is characterized by a right-sided aortic arch, distinctive facial features, and intellectual disability.

What the name means: The aortic arch is the curved part of the main artery leaving the heart. In most people it arches to the left. In this syndrome, a right-sided aortic arch was reported. "Peculiar facies" is older medical wording for a recognizable pattern of facial differences. Modern writing usually says craniofacial dysmorphism.

Reported features: Reported findings include right-sided aortic arch, microcephaly, facial asymmetry, broad forehead, widely spaced eyes or borderline hypertelorism, nasal septum deviation, large nasal cavity, large posteriorly rotated ears, small mouth with downturned corners, and intellectual disability. Because so few people have been reported, the full range of features is uncertain.

Cause and inheritance: The original family pattern suggested autosomal dominant inheritance, meaning one changed copy of a responsible gene might be enough to cause the condition. However, the exact gene has not been firmly established in routine clinical references. For modern patients with similar findings, chromosomal microarray or genome sequencing may identify a more specific diagnosis.

Diagnosis: Diagnosis would be clinical and genetic. Evaluation includes echocardiography or cardiac imaging to define the aortic arch and any associated heart differences, developmental assessment, genetics consultation, and review for other syndromes that can include right aortic arch and developmental delay.

Management: Care depends on the person's findings. It may include cardiology monitoring, developmental therapies, educational support, speech therapy, occupational therapy, and treatment of feeding, breathing, or other associated issues. Because the literature is very limited, care should be individualized.

Key takeaway: This is a rare historical syndrome label. For students, the safest approach is to understand the reported pattern while recognizing that modern genetic testing may reclassify similar patients.

Sources reviewed: Orphanet; NCBI MedGen; NIH Genetic and Rare Diseases Information Center summaries.