Providing secure, extensible, pervasive and easy to implement collaborative environment for medical applications poses significant challenge for state-of-the-art computer systems and networks. In this paper, we describe such a collaborative environment developed for Ithanet project, based on Grid authentication mechanisms. Significant effort has been put into developing a system, that is capable of deployment across tightly secured networking environments as implemented in vast majority of hospitals. The environment is extensible enough to incorporate Grid-service based collaborative systems like AccessGrid.