Spigelian hernia with unusual content

We present a case of a primary tumor of the peritoneum that manifested as a spigelian hernia in a 74-year-old woman. Multidetector computed tomography showed a large heterogeneous mass located subcutaneously on the right spigelian line connected to the abdominal cavity. We found no previous report describing a primary peritoneal tumor in a spigelian hernia.