DiscussionMany variables can affect the stability of sclerosing foams produced by the Tessari method, such as the type of the detergent, solution concentration, the number of pumping cycles, the liquid–gas ratio, and any chemicals used for the foam production.8 Recently, the foam stability was successfully improved by adding HA to POL solutions. The reason why HA can improve foam longevity is not well understood. An interpretation of the authors is related to the fact that this GAG would act as a viscosity enhancer for scler- osing solutions, slowing the liquid drainage during the destructuration of foams