The family learns that a 3D ultrasound of a 9-week fetus shows incomplete fusion of the na-somedial process. What is this defect commonly called?
a. Cleft lip
b. Nasal passage atresia
c. Esophageal atresia
d. Lack of dentition
ANS: A
Cleft lip, not nasal passage atresia, occurs when there is lack of or incomplete fusion of the na-somedial or intermaxillary process. In esophageal atresia, the esophagus ends in a blind pouch. Lack of dentition is not due to incomplete fusion of the processes.
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