Spigelian hernia.

This article reviews the literature on Spigelian hernia and discusses the anatomy, definitions, etiology, clinical diagnosis, and treatment. Ultrasonic scanning and computed tomography have been successful in improving diagnosis. In cases of palpable Spigelian hernia, a gridiron incision is recommended; in non-palpable hernia, a vertical incision and preperitoneal dissection offers several advantages.