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Hemifacial microsomia is a congenital condition characterized by underdevelopment of one side of the face, and it is associated with various genetic syndromes. The condition can be linked to abnormalities in the development of the first and second pharyngeal arches during embryonic growth.

The correct answer identifies that hemifacial microsomia can be associated with Trisomy 21 (Down syndrome) and Treacher-Collins syndrome, both of which are recognized genetic disorders. Trisomy 21 is a chromosomal condition caused by the presence of an extra chromosome 21, leading to developmental and physical challenges, and it has been found in some cases to correlate with facial abnormalities. Treacher-Collins syndrome, on the other hand, is a genetic disorder characterized specifically by craniofacial deformities, which can include features similar to those seen in hemifacial microsomia.

This association underscores the importance of considering chromosomal abnormalities and established syndromes when evaluating a child with hemifacial microsomia. The presence of these genetic conditions provides a better understanding of the potential underlying causes and allows for more targeted care and support for individuals affected by these conditions.