Introduction: The Spigelian hernia or lateral ventral hernia is an unusual dehiscence appearing on Spigel\'s line or semi-lunar fascia. It is a rare clinical entity, represents 0.10 to 1% of hernias. Also, it seemed appropriate to report this case collected in the visceral surgery department of the Moulay Ismail military hospital. Patient and observation: We report the observation of a 48-year-old patient with no particular history. with a progressive right umbilical swelling, a Spigelien hernia was suspected on clinical examination, and the diagnosis of left anterolateral forceps was retained on abdominal computed tomography. Prolene plaque herniation was performed and the operative follow-up was simple. Conclusion: Spigelien hernia is a rare condition; its clinical diagnosis can be difficult. It is asymptomatic in 90% of cases and its positive diagnosis is radiological. The risk of significant strangulation requires surgical treatment once the diagnosis is confirmed.