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Spigelian Hernia: Causes, Symptoms & Treatment

A Spigelian hernia is a rare type of abdominal wall hernia in which tissue protrudes through a weakness along the Spigelian line, located at the outer edge of the rectus muscle.

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Things worth knowing about "Spigelian Hernia"

A Spigelian hernia is a rare type of abdominal wall hernia in which tissue protrudes through a weakness along the Spigelian line, located at the outer edge of the rectus muscle.

What is a Spigelian Hernia?

A Spigelian hernia is a rare form of abdominal wall hernia. It occurs when abdominal contents, such as peritoneal fat or a portion of the intestine, protrude through a defect in the Spigelian fascia (also known as the linea semilunaris). This line runs along the lateral edge of the rectus abdominis muscle, marking the transition to the oblique abdominal muscles. Because the hernial sac often remains between muscle layers and does not visibly bulge outward, Spigelian hernias are sometimes called interstitial or hidden hernias, making diagnosis particularly challenging.

Causes

A Spigelian hernia develops when there is a weakness in the abdominal wall at the Spigelian line. Common causes and risk factors include:

Congenital weakness of connective tissue in the abdominal wall
Advancing age with progressive loss of muscle tone and tissue strength
Increased intra-abdominal pressure due to chronic cough, constipation, or straining
Pregnancy and the associated mechanical strain on the abdominal wall
Obesity, which places additional pressure on the abdominal wall
Previous abdominal surgery leading to scar tissue formation
Heavy physical labor or intense physical activity

Symptoms

The symptoms of a Spigelian hernia can vary depending on the size and exact location of the defect:

Dull or sharp pain in the lateral lower abdomen, often worsened by physical activity
A palpable or occasionally visible bulge along the lateral abdominal wall (not always present)
Worsening of discomfort when coughing, sneezing, or straining
Nausea or digestive complaints if bowel structures are involved
In the case of incarceration (strangulation): sudden severe pain, nausea, and vomiting -- this constitutes a surgical emergency

Diagnosis

Diagnosing a Spigelian hernia can be difficult because the protrusion lies between muscle layers and is often not visible on the surface. The following diagnostic methods are used:

Physical examination: Palpation of the abdominal wall, especially when the patient tenses the abdominal muscles
Ultrasound (sonography): The preferred first-line imaging method; it can visualize the hernial defect and its contents
Computed tomography (CT scan): Used in unclear cases or when complications are suspected; provides detailed cross-sectional images
Magnetic resonance imaging (MRI): Less commonly used but helpful in complex cases

Treatment

Because Spigelian hernias carry a higher-than-average risk of incarceration, surgical repair is generally recommended once the diagnosis is confirmed. Two main approaches are available:

Open Surgical Repair

In open surgery, an incision is made directly over the hernia defect. The hernial contents are reduced back into the abdominal cavity, and the defect is closed either with a synthetic mesh or by suturing the surrounding tissue. This approach is particularly suitable for larger hernias or in emergency situations.

Laparoscopic (Minimally Invasive) Repair

In laparoscopic surgery, small incisions are made and a camera system is introduced. A mesh is placed internally over the abdominal wall defect. This technique offers advantages including shorter recovery times, less postoperative pain, and a reduced risk of wound infection.

Postoperative Care

After surgery, patients should avoid heavy lifting and strenuous physical activity for several weeks. Regular follow-up appointments are recommended to detect any recurrence at an early stage.

References

Skandalakis P.N. et al. - Spigelian hernia: a review of the literature and report of two cases. Hernia, 2006; 10(6): 524-527.
Mittal T. et al. - Spigelian hernia: a systematic review. Journal of Minimal Access Surgery, 2008; 4(4): 105-107.
Townsend C.M. et al. - Sabiston Textbook of Surgery, 20th Edition. Elsevier, 2017.

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