UMBILICAL PILONIDAL-SINUS

Although most cases of pilonidal sinus occur in the sacrococcygeal reg ion, umbilical presentations can occur. Due to the risk of peritoneal extension of inflammation from this lesion, the umbilical pilonidal si nus should be treated more aggressively than its sacrococcygeal counte rpart. Pilonidal sinus should therefore be included in the differentia l diagnosis of umbilical nodules.