Masson was a French publisher specialised in medical and scientific collections. In 1987, Masson purchased Armand Colin. In turn, it became part of the City Group (Groupe de la Cité) in 1994. In 2000, Groupe de la Cité became part of Vivendi Universal Publishing (VUP). VUP sold its medical and trade publishing to a group led by Cinven in 2002, who formed MediMedia. In 2005, MediMedia sold its European and U.S. Netter professional medical publishing businesses to Reed Elsevier. Masson merged with Elsevier France, creating Elsevier Masson.