An unusual presentation of an incarcerated Spigelian hernia.

Spigelian hernias are rare hernias, occurring through a defect in the Spigelian aponeurosis. Like other hernias, they may contain abdominal contents but are more likely to be incarcerated due to the small size of the fascial defect. Multiple intra-abdominal organs have reportedly been found in Spigelian hernias. A search of the literature showed only nine reported cases in which an appendix has been found within a Spigelian hernia. We present a patient with a history of lower abdominal pain since 10 weeks with a large intra-abdominal mass in the right iliac fossa. Due to abscess formation with spontaneous evacuation through the abdominal wall, drainage and incision were performed and the patient was treated with broad-spectrum antibiotics. An explorative laparoscopy after six weeks showed an incarcerated appendix in a Spigelian hernia.