ABSTRACT
Lars Leksell introduced his first stereotactic frame in 1949 [1]. Despite numerous modifications over the intervening years, the design and function of the Leksell frame continues to be based on the arc-centered principle [2]. Arc-centered frames position the surgical target in the center of an operating arc. So positioned, the target can be reached from any entry point, as long as the surgical probe is advanced the distance of the radius. This simple yet effective design provides versatility, ease of use, and great accuracy.
