High grade dysplasia means that there are severely abnormal cells in the inner lining of the oesophagus. This is sometimes called stage 0.
The high grade dysplasia is only in the top layer of cells lining the inside of the oesophagus (the epithelium). It has not started to grow into the deeper layers.
High grade dysplasia can change to invasive cancer if you don't have treatment.
People with Barrett’s oesophagus have a small risk of developing these abnormal cells.
Removing the lining of your oesophagus is the main treatment for high grade dysplasia.
You have this surgery through a tube called an endoscope. You are asleep when you have it. The doctor puts the tube down your throat. They can then put a thin wire (snare) through the tube to remove the abnormal area of tissue.
You might also need treatment to destroy any abnormal areas that the doctor has not been able to remove. This treatment is called radiofrequency ablation.