[Petit's triangle hernia clinically mimicking gluteal abscess].

Lumbar hernias are a very uncommon variety of abdominal wall defects. Diagnosis similar as obturatory hernia is often delayed until laparotomy. We describe a case of a 58 year old woman with parietal incarceration of the descending colon within a hernia in the inferior lumbar triangle (Petit's), under clinical form of a giant gluteal abscess.