  An analytical solution to the the three-dimensional telegraph equation is
presented. This equation has recently received some attention but so far the
treatment has been one-dimensional. By using the structural similarity to the
Klein-Gordon equation, the telegraph equation can be solved in closed form.
Illustrative examples are used to discuss the qualitative differences to the
diffusion solution. The comparison with a numerical test-particle simulation
reveals that some features of an intensity profile can be better explained
using the telegraph approach.
