  We analyze the results of a paper on "the arising of a Rashba-like coupling,
a Zeeman-like term and a Darwin-like term induced by Lorentz symmetry breaking
effects in the non-relativistic quantum dynamics of a spin-1/2 neutral particle
interacting with external fields". We show that the authors did not obtain the
spectrum of the eigenvalue equation but only one eigenvalue for a specific
relationship between model parameters. In particular, the existence of allowed
cyclotron frequencies conjectured by the authors is a mere artifact of the
truncation condition used to obtain exact solutions to the radial eigenvalue
equation.
