9.7
Esophageal Strictures-I: Introduction
Esophageal strictures involve abnormal narrowing or tightening of the esophagus. They vary in length and severity, ranging from mild constriction to c…
Esophageal strictures refer to the abnormal narrowing or tightening of the esophageal lumen, ranging from a mild constriction to a complete obstruction.
The most common cause of esophageal strictures is chronic acid reflux, which triggers inflammation, damages, and scars the esophageal lining, leading to strictures.
Accidental or intentional ingestion of acids or alkalis damages the esophagus, with acids causing coagulative necrosis and alkalis causing liquefactive necrosis; both can result in stricture formation.
Furthermore, radiation therapy to the cervical or thoracic regions for cancer treatment can harm the esophagus, causing radiation-induced esophageal stricture.
Next is eosinophilic esophagitis, an allergic condition where the esophagus fills with eosinophils, causing swelling, narrowing, and esophageal stricture.
Lastly, damage caused by endoscopic procedures can cause physical trauma to the esophageal lining, leading to esophageal strictures.
Other causes of esophageal strictures include tumors, congenital esophageal strictures, prolonged NSAID use, extended nasogastric tube use, GERD Nissen fundoplication surgery, and the presence of foreign objects in the esophagus.
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Q1: What causes esophageal strictures?
The primary cause of esophageal strictures is chronic gastroesophageal reflux disease, accounting for 70-80% of adult cases. Acid reflux damages and scars the esophageal lining, leading to narrowing. Other causes include ingestion of corrosive substances, radiation therapy to the chest or neck, eosinophilic esophagitis, endoscopic trauma, tumors, prolonged nasogastric tube use, and post-surgical complications.
Q2: How do acids and alkalis damage the esophagus differently?
Acids cause coagulative necrosis, which creates a defined boundary of tissue death. Alkalis cause liquefactive necrosis, resulting in deeper, more diffuse tissue damage. Both types of chemical injury can lead to stricture formation as the esophagus heals and scars. The extent of damage depends on the concentration, duration of contact, and type of substance ingested.
Q3: What is eosinophilic esophagitis and how does it cause strictures?
Eosinophilic esophagitis is an allergic condition where eosinophils accumulate in the esophageal tissue, causing inflammation and swelling. This inflammatory response narrows the esophageal lumen, potentially leading to stricture formation. The condition represents an immune-mediated response rather than infectious or mechanical obstruction.
Q4: How can radiation therapy lead to esophageal strictures?
Radiation therapy targeting the cervical or thoracic regions for cancer treatment can damage the esophageal tissue as a long-term complication. The targeted radiation harms surrounding soft tissues, including the esophagus, causing scarring and fibrosis. Strictures typically develop within a median of 6 months post-treatment as the tissue heals abnormally.
Q5: How do malignant tumors cause esophageal narrowing?
Malignant tumors infiltrate the esophageal layers—mucosa, submucosa, muscularis propria, and adventitia—causing scarring and fibrosis that narrows the lumen. Additionally, tumors in adjacent organs or lymph nodes exert external pressure on the esophagus, further constricting it. This dual mechanism of internal infiltration and external compression leads to stricture formation.
Q6: What is the difference between benign and malignant esophageal strictures?
Benign strictures are noncancerous narrowings caused by inflammation, scarring, or trauma from conditions like GERD, chemical ingestion, or radiation. Malignant strictures result from cancerous tumor infiltration and growth within the esophageal layers. Both types vary in length and severity, ranging from mild constriction to complete obstruction, but require different management approaches.
Q7: What other risk factors can contribute to esophageal stricture development?
Additional risk factors include congenital abnormalities, prolonged nasogastric tube use that causes mechanical irritation, long-term NSAID medication use that damages the lining, and post-surgical complications following fundoplication for GERD. Endoscopic procedures can also cause physical trauma leading to strictures. Foreign objects lodged in the esophagus represent another potential cause.