Richter's hernia through a Spigelian defect of the abdominal wall.

A 78-year-old healthy woman with no previous surgeries or history of trauma presented with a painful abdominal mass for 1 day. The computed tomography (CT) scan of the abdomen demonstrated a partial herniation and strangulation of the cecum (Richter's hernia) between the internal and external oblique muscles through the linea semilunaris (Spigelian hernia). The challenging clinical diagnosis of Spigelian hernias and their surgical treatment options are discussed.