Hirschsprung disease, postaxial polydactyly, and atrial septal defect

Area of Science:

• Medical Genetics
• Pediatric Cardiology
• Developmental Biology

Background:

• Hirschsprung disease is a congenital disorder characterized by the absence of ganglion cells in the distal colon, leading to functional obstruction.
• Postaxial polydactyly is a limb malformation involving extra digits on the ulnar/fibular side of the limb.
• Congenital heart defects, such as atrial septal defects (ASDs) and ventricular septal defects (VSDs), are common in various genetic syndromes.

Observation:

• A case report of an infant girl born to a consanguineous couple presenting with Hirschsprung disease, postaxial polydactyly, and an atrial septal defect.
• The patient's presentation suggests a potential syndromic condition with overlapping features to previously described genetic disorders.

Findings:

• The infant exhibits a combination of gastrointestinal (Hirschsprung disease), skeletal (postaxial polydactyly), and cardiac (atrial septal defect) anomalies.
• Comparison with a historical case report by Laurence et al. (1975) reveals similarities in aganglionic megacolon and postaxial polydactyly, with a ventricular septal defect noted in the earlier report.
• The consanguineous parentage raises the possibility of an autosomal recessive (AR) inheritance pattern for this constellation of symptoms.

Implications:

• This case expands the known phenotypic spectrum associated with rare genetic disorders affecting multiple organ systems.
• Further genetic investigation is warranted to identify the underlying molecular cause and confirm the suspected autosomal recessive inheritance.
• Understanding this condition can aid in early diagnosis, genetic counseling, and management strategies for affected individuals and families.