A 43-year-old woman is admitted to the emergency department with esophageal pain and hematemesis after swallowing a fish bone. An endoscopic examination reveals perforation of the intraabdominal portion of the esophageal wall. Which of the following arteries is most likely injured?
## Core Concept
The question tests knowledge of the blood supply to the esophagus, specifically the arteries that supply the intraabdominal portion of the esophagus. The esophagus receives its blood supply from multiple arteries along its course, including the inferior thyroid arteries, intercostal arteries, inferior esophageal artery (a branch of the thoracic aorta), and the left gastric artery.
## Why the Correct Answer is Right
The intraabdominal portion of the esophagus is primarily supplied by the **left gastric artery**, which is a branch of the celiac trunk. This artery gives off esophageal branches that supply the lower part of the esophagus. Given that the perforation occurred in the intraabdominal portion of the esophagus, the left gastric artery is the most likely source of bleeding due to its direct supply to this area.
## Why Each Wrong Option is Incorrect
* **Option A:** The inferior thyroid arteries primarily supply the cervical portion of the esophagus. They are less likely to be involved in a perforation of the intraabdominal esophagus.
* **Option B:** The inferior esophageal artery, a branch of the thoracic aorta, supplies the thoracic portion of the esophagus. While it could potentially be involved in injuries to the thoracic esophagus, it is less likely to be the source of bleeding for an intraabdominal esophageal injury.
* **Option D:** Without specific details on the option, it's challenging to directly refute it. However, given the context, any option not directly related to the blood supply of the intraabdominal esophagus would be incorrect.
## Clinical Pearl / High-Yield Fact
A key point to remember is that the blood supply to the esophagus is segmental, coming from different arteries along its course from the neck to the abdomen. Specifically, recall that the **left gastric artery** supplies the intraabdominal esophagus, making it a critical consideration in cases of lower esophageal injury.
## Correct Answer: C. Left gastric artery.