CT was performed to assess for the presence of obstruction or mass. The radiographic findings show the presence of a hernia involving the left lower quadrant anterior abdominal wall. The small bowel proximal to this hernia is dilated and is presumed to be secondarily obstructed due to the hernia.
Spigelian hernias are hernias which occur in the anterolateral wall of the lower abdomen.
These hernias occur along the semilunar line which is formed with the union of the rectus sheath and aponeuroses of the transversus abdominis muscle and oblique abdominal muscle. Most of these hernias are secondary to a congenital weakness in the posterior layer of the transversalis fascia through which this hernia occurs. Diagnosis of this lesion is sometimes difficult due to the deep anatomic location at which these hernias occur. Typically the patients present with a prolonged history of intermittent lower abdominal pain and may have a swelling or vanishing mass midway between the umbilicus and symphysis pubis. Males are equally affected as females.