Lasers in gastroenterology

Figure 2 Photodynamic therapy for dysplasia in Barrett's oesophagus: (A) prior to therapy, columnar lined mucosa is seen at endoscopy. Dysplasia is not visible, but has been confirmed histologically; (B) one day after treatment, there is widespread sloughing of the oesophageal mucosa; (C) one month later, the oesophagus has completely healed with some regeneration of squamous mucosa.