Question

The accompanying histology slide of esophageal mucosa shows the lower esophageal lining replaced by columnar (intestinal-type) epithelium with goblet cells in place of the normal stratified squamous epithelium. Which condition does this represent?

• A. Barrett's esophagus
• B. Squamous cell carcinoma
• C. Adenocarcinoma
• D. Low grade dysplasia

Hint:

Look for goblet cells (intestinal metaplasia) in the lower esophageal mucosa.

Answer 1

The Correct Option is A

Step 1: Recall the normal histology. The normal esophagus is lined by non-keratinised stratified squamous epithelium. Chronic gastro-esophageal reflux damages this lining.

Step 2: Identify the metaplastic change. When the squamous epithelium is replaced by columnar epithelium containing intestinal-type goblet cells (intestinal metaplasia), the diagnosis is Barrett's esophagus. The presence of goblet cells (specialised intestinal metaplasia) is the histological hallmark.

Step 3: Match to the slide. The slide shows columnar epithelium with goblet cells replacing squamous mucosa - classic Barrett's metaplasia, not malignancy.

Step 4: Eliminate the others. Squamous cell carcinoma shows malignant squamous cells with keratin pearls; adenocarcinoma shows malignant glandular architecture with invasion; low-grade dysplasia shows nuclear stratification and hyperchromasia within the metaplastic epithelium but is not the basic metaplastic change itself. The picture of goblet-cell columnar metaplasia without cytological atypia is Barrett's esophagus.

Key fact: Replacement of esophageal squamous epithelium by columnar epithelium with goblet cells = Barrett's esophagus (intestinal metaplasia), a premalignant condition for adenocarcinoma.