  In the framework of seesaw models with only two heavy Majorana neutrinos,
nonzero leptonic asymmetries can be radiatively generated when exact heavy
neutrino mass degeneracy ($M_1=M_2=M$) is imposed at a scale $\Lambda_D > M$.
For a specific case, we show that an acceptable value for the baryon asymmetry
of the Universe can be obtained considering thermal leptogenesis.
