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KEY POINTS

Key Points

  • image There are differences in the anatomic structure in the rectus sheath above and below the arcuate line. Below the arcuate line, all the lateral fascial layers combine and travel anteriorly forming the anterior rectus sheath and leaving the posterior aspect of the lower portion of the rectus muscles without an aponeurotic covering. Above the arcuate line, the posterior rectus sheath is formed by a portion of the internal oblique aponeurosis and the transversus abdominus sheath, and the anterior rectus sheath is formed by the remaining fibers of the internal oblique and the external oblique aponeuroses.

  • image Two randomized trials have found that closure of midline incisions with small fascial stitches of five to eight mm length and five mm width is beneficial in preventing incisional hernias of the abdominal wall.

  • image Primary repair of ventral incisional hernias results in high recurrence rates, and repair utilizing other methods, including prosthetic mesh and component separation, are preferred techniques of repair.

  • image Laparoscopic incisional hernia repair results in similar recurrence rates and wound infections, compared to open repair. Laparoscopic repair may result in a faster recovery and shorter hospitalization; however, there may be an increase in bowel injury when compared to an open repair.

  • image Desmoid tumors should be monitored for asymptomatic patients as there is a possibility of spontaneous regression. For patients with rapidly growing or symptomatic tumors resection is recommended. If complete pathologic resection is not achievable without significant morbidity, more modest resection is recommended along with treatment with adjuvant therapies.

  • image The omentum provides an immunogenic and fibrotic response to foreign stimuli, allowing the abdomen to wall off infections preventing diffuse peritonitis.

  • image The role of surgery in the treatment of sclerosing mesenteritis is minimal and is most often undertaken to obtain tissue for diagnosis. Most cases should be treated medically with surgical interventions reserved for cases of bowel obstruction and ischemia.

  • image Surgical interventions for retroperitoneal fibrosis include obtaining tissue for pathologic diagnosis, relieving ureteral obstructions via ureterolysis or ureteral stenting, and relieving vascular obstructions via endovascular stenting of affected vessels. Most cases are treated successfully with the use of steroids.

ABDOMINAL WALL

General Considerations

Incision and closure of the abdominal wall is among the most common surgical procedures performed. Knowledge of its layered anatomy is critical in the management of surgical patients. Cranially defined by the costal margin and xiphoid process and caudally ending over the pubic bones of the pelvis, the abdominal wall provides support and protection to the peritoneal and retroperitoneal organs.

Surgical Anatomy

Embryologically, the abdominal wall is derived from the mesoderm and envelops the future abdominal contents as bilateral migrating layers originating from the paravertebral area. The leading bars of these sheets fuse in the midline as the linea alba at 7 weeks after gestation and reach the umbilicus at 8 weeks.

The abdominal wall consists of nine distinct ...

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