[Torsion of the large omentum in Prader-Willi syndrome].

Although excess fat deposition in the omentum and obesity have been suggested as possible predisposing factors for omental torsion, no previous descriptions of an association between the Prader-Willi syndrome and omental torsion have been found in the literature. We therefore report the case of a 6-year-old boy with Prader-Willi syndrome and primary torsion of the greater omentum.