The structure of leading logarithms in chiral perturbation theory was already studied some time ago by S. Weinberg, Physica  A96, 327 (1979) and recently by M. Buchler, G. Colangelo,  Eur. Phys. J. C32, 427 (2003). Because the leading logarithms may generate sizable numerical contributions to observables, it would be very interesting to know them or even sum them up to every order in the chiral expansion. We investigate these possibilities for two specific Green functions in chiral perturbation theory with two flavours, in the chiral limit.

PACS numbers: 11.30.Rd