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Pathology
A 3-year-old boy dies in an automobile accident. At autopsy the right lung is markedly shrunken. Dissection shows that the right main stem bronchus ends blindly in nondescript tissue composed of rudimentary ducts and connective tissue. This finding represents an example of which of the following errors of morphogenesis?
Aplasia
Atresia
Dysraphic anomaly
Hypoplasia
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