What are the types of esophageal strictures?

What are the types of esophageal strictures?

Strictures may be simple or complex:

• Simple strictures are smaller, leaving a wider opening in the esophagus. They are usually straight and symmetrical. Their surfaces and margins (borders) are smooth.
• Complex strictures are longer and leave a narrower opening. They are not straight or symmetrical and have uneven surfaces and margins.