A patient has increased number of columnar cells in lower esophagus. He has which of the following change:
**Core Concept**
The presence of an increased number of columnar cells in the lower esophagus is a characteristic feature of Barrett's esophagus, a condition where the normal squamous epithelium of the esophagus is replaced by metaplastic columnar epithelium. This change is often associated with gastroesophageal reflux disease (GERD) and increases the risk of esophageal adenocarcinoma.
**Why the Correct Answer is Right**
The development of Barrett's esophagus involves chronic exposure of the esophageal mucosa to acid and bile, leading to inflammation and damage to the epithelial lining. This triggers a healing response, where the body attempts to replace the damaged squamous epithelium with a more resilient columnar epithelium. The increased number of columnar cells in the lower esophagus is a result of this metaplastic process, which is often accompanied by intestinal metaplasia, characterized by the presence of goblet cells.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the clinical scenario of increased columnar cells in the lower esophagus.
* **Option B:** While GERD is a common cause of esophageal symptoms, it is not the primary change associated with an increased number of columnar cells in the lower esophagus.
* **Option C:** This option is incorrect because it does not directly relate to the histological changes observed in Barrett's esophagus.
**Clinical Pearl / High-Yield Fact**
Barrett's esophagus is a premalignant condition, and patients with this diagnosis should undergo regular endoscopic surveillance to detect dysplasia or adenocarcinoma at an early stage.
**Correct Answer:** C. Intestinal metaplasia