Atmospheric neutrino oscillations with MACRO

We present the latest results on the study of atmospheric neutrino oscillations with the MACRO detector at Gran Sasso. Two sub-samples of events have been analysed, both in terms of absolute flux and zenith angle distribution: high energy events (with <E-nu> similar or equal to 50 GeV) and low energy events (with <E-nu> similar or equal to 4 GeV). The high energy sample has been used also to check the numu <----> nu(sterile) oscillation hypothesis and to estimate neutrino energies using Multiple Coulomb Scattering (MCS) informations. All these analyses are mutually consistent and strongly favour the nu(mu) <----> nu(tau) oscillation hypothesis with maximal mixing and Deltam(2) = 2.5 . 10(-3) eV(2).