Herniated distal ileal loops & omental fat through defect within the semilunar line, located just posterolateral to lateral border of right rectus abdominis. The herniated bowel is located deep to the right external oblique muscle. There is associated diltation of afferent loop of the herniated bowel and ileal and jejunal bowel loops, with small bowel faeces sign noted just proximal to site of obstruction. Finding are consistent with a Spigelian hernia causing small bowel obstruction.