[Peristomal hernia: alloplasty using an original technique]. / L'ernia peristomale: alloplastica con tecnica originale.

The case is reported of a 67-year-old male patient with a voluminous parastomal hernia after a Miles abdomino-perineal resection and consequent definitive terminal colostomy for a rectal adenocarcinoma. The aim of the study was to investigate the efficacy of a new alloplasty technique for parastomal hernia using a Goretex Dual Mesh Plus prosthesis placed under the peritoneum, directly in contact with the intestinal loop. Two important factors should be considered, namely, the high rate of relapse due to fascial repair with or without prostheses and the greater invasiveness of surgical treatment involving the construction of a new stoma in another site after re-laparotomy. Alloplasty with a Goretex Dual Mesh prosthesis under the peritoneum is a valid alternative to other procedures in view of the excellent outcome we obtained in the case described.

Softening of the equation of state of matter at large densities and temperatures: chiral-symmetry restoration versus quark deconfinement.

We discuss two models in which a softening of the equation of state takes place due to the appearance of new degrees of freedom. The first is a hadronic model in which the softening is due to chiral symmetry restoration. In the second model the softening is associated with the formation of clusters of quarks in the mixed phase. We show that in the first case the bulk modulus is mainly dependent on the density, while in the mixed-phase model the bulk modulus strongly depends on the temperature and it is not vanishing due to the presence of two conserved charges, the baryon and the isospin one.