[Flat angioma. Therapeutical value of the laser]

Following a summary of the principles of quantum physics required to understand how lasers work, the main lasers used in therapeutics are described, together with their characteristics. Only the argon laser is used in the treatment of port wine stains. The selection of cases for laser treatment is based on such criteria as colour of the lesion, speed of recoloration and patient's age. Local complications are sometimes observed. The argon laser undoubtedly constitutes a progress in the treatment of port wine stains, a condition where surgery remains disappointing.