Dysphagia lusoria is caused by?
**Core Concept**
Dysphagia lusoria is a rare clinical condition characterized by difficulty swallowing, caused by an aberrant right subclavian artery compressing the esophagus. This condition is often associated with a congenital anomaly of the aortic arch.
**Why the Correct Answer is Right**
The aberrant right subclavian artery arises from the left side of the aortic arch and crosses over the midline to reach the right arm, compressing the esophagus in the process. This compression can lead to dysphagia, especially to solid foods. The esophagus is particularly vulnerable to compression at the level of the aortic arch, where the esophagus passes in front of the vertebral bodies and is closely associated with the aortic arch.
**Why Each Wrong Option is Incorrect**
**Option A:** Aortic aneurysm is not typically associated with dysphagia lusoria, as the compression is usually caused by a normal artery, not a dilated one.
**Option B:** Esophageal stricture is a different condition altogether, caused by scarring and narrowing of the esophagus, often due to chronic inflammation or acid reflux.
**Option C:** Achalasia is a motility disorder of the esophagus, characterized by failure of the lower esophageal sphincter to relax, leading to difficulty swallowing solid foods.
**Clinical Pearl / High-Yield Fact**
Dysphagia lusoria is a classic example of a vascular compression syndrome, highlighting the importance of considering vascular anomalies in the differential diagnosis of esophageal disorders.
**Correct Answer: C. Achalasia is not correct since the correct answer is not in the options given, however the correct answer based on the available options is not relevant to the question as given.