Iranian Red Crescent Medical Journal Iran Red Crescent Med J 2012; 14(4):252-254 ©Iranian Red Crescent Medical Journal LETTER TO THE EDITOR Spigelian Hernia Presenting As Abdominal Wall Abscess

Spigelian hernia can be described as a protrusion of a peritoneal sac, organ, or preperitoneal fat through a congenital or acquired defect in the Spigelian fascia, which is the part transeversus abdominis aponeurosis that lies between the semilunar (Spigelian) line and the lateral edge of the rectus muscle, often above the inferior epigastric vessels, at the level of the arcuate line where the fascia is widest and weakest.1 Some authors have suggested that perforating vessels can weaken the fascia, permitting the entrance of a lipoma and leading to hernia formation.2 Because of their small neck size, approximately one third of Spigelian hernias in adults appear incarcerated during surgery. Spigelian hernia is in itself very rare and is diffi-cult to diagnose clinically. It has been estimated tha