The spiral galaxy NGC 4258 is known for its anomalous Hα and nonthermal radio arms perpendicular to the normal spiral arms (van der Kruit et al., 1972). Several models have been proposed to explain this phenomenon and its origin is most probably to be sought in the past activity of the nucleus of NGC 4258. Most of the characteristics of the anomalous arms, such as the symmetry with respect to the center, or the properties of the emission lines (pure Hα line emission with no continuum, line ratio between Hα and [NII]) are reminiscent of the optical and radio jets currently observed in active galaxies.