Lugol's iodine to map squamous dysplasia

A short clip of Lugol's dye spray. Teaching points includes:

• Squamous dysplasia is well seen by blue light technologies
• First wash with lots of acetylcysteine
• Consider topical lignocaine but don't mix it with Lugol's
• Dilute the 5% Lugol's down to 1%
• Flat squamous dysplasia can usually be resected whilst nodules usually can't be