The mother of a newborn boy is alarmed that her baby regurgitates at every feeding. An endoscopic examination reveals that the child’s esophagus is almost completely occluded. This finding represents an example of which of the following errors of morphogenesis?
**Core Concept**
The question pertains to errors of morphogenesis, specifically a congenital anomaly affecting the esophagus. Morphogenesis refers to the biological process by which tissues and organs develop their shape. Errors in morphogenesis can lead to various congenital abnormalities, including atresias, aplasias, dysplasias, and dysraphic anomalies.
**Why the Correct Answer is Right**
Atresia is a congenital anomaly characterized by the partial or complete closure of a body cavity or tubular organ. In this case, the esophagus is almost completely occluded, which is a classic example of esophageal atresia. This condition occurs due to a failure in the proper formation of the esophagus during embryonic development. The esophagus fails to canalize or connect properly, resulting in a blind-ending pouch or a complete obstruction.
**Why Each Wrong Option is Incorrect**
**Option A:** Aplasia refers to the complete absence or failure of development of a tissue or organ. While aplasia can affect the esophagus, it does not accurately describe the condition where the esophagus is partially or completely occluded but still present.
**Option C:** Dysplasia refers to the abnormal growth or development of cells, often leading to neoplastic lesions. Dysplasia is not directly related to the congenital anomaly of esophageal atresia.
**Option D:** Dysraphic anomaly refers to a congenital defect resulting from the failure of neural tube closure during embryonic development. This type of anomaly typically affects the central nervous system and is not relevant to esophageal atresia.
**Clinical Pearl / High-Yield Fact**
When evaluating a newborn with feeding difficulties and regurgitation, it is essential to consider congenital anomalies such as esophageal atresia. Early diagnosis and treatment can significantly improve outcomes and prevent complications.
**✓ Correct Answer: B. Atresia**