Thermodynamic quantities in symmetric nuclear matter are calculated in a self-consistent T-matrix approximation at zero and finite temperatures. The internal energy is calculated from the Galitskii--Koltun's sum rule and from the summation of the diagrams for the interaction energy. The pressure and the entropy at finite temperature are obtained from the generating functional form of the thermodynamic potential.

PACS numbers: 21.30.Fe, 21.65.+f, 24.10.Cn