Assessment of Nerve Fiber Density and Expression of Hormonal Receptors Within Rectosigmoid Endometriosis Nodules

STUDY OBJECTIVE

To assess nerve fiber density and expression of hormone receptors in bowel endometriosis.

DESIGN

Cross-sectional study.

SETTING

Private hospital.

PATIENTS

Women with endometriosis undergoing laparoscopic segmental bowel resection (n = 54).

INTERVENTIONS

Tissue samples were obtained from patients with surgically treated rectosigmoid endometriosis.

MEASUREMENTS AND MAIN RESULTS

The rectosigmoid specimen containing the endometriosis nodule was manually sectioned and divided into 3 areas: core of the nodule, margin of the nodule, and healthy bowel tissue. The intensity of expression of estrogen and progesterone receptors was evaluated by immunohistochemistry and measured according to the Allred score. Nerve fibers were stained by immunohistochemistry using Protein Gene Product 9.5, and the density of nerve fillets was counted and expressed in number/mm². All glandular and stromal cells stained for estrogen; however, glandular cells stained more strongly than stromal cells (61.1% vs 35.2%; p = .01). Most of glandular and stromal cells stained strongly for progesterone receptors (90.7% vs 98.1%; p = .2). The density of nerve fibers was very high in the margin of the nodule (172.22±45.66/mm²), moderate in healthy bowel tissue (111.48±48.57/mm²), and very low in the core of the nodule (7.31±4.9/mm²); p = .01.

CONCLUSION

Both glandular and stromal cells within the rectosigmoid endometriosis nodule express estrogen and progesterone receptors. Higher intensity of expression of estrogen receptors occurs in glandular cells. The density of nerve fibers is extremely high at the nodule margin and very low in the center of the nodule.

Peritoneal Retraction Pocket Defects and Their Important Relationship with Pelvic Pain and Endometriosis

OBJECTIVE

The objective of this video is to demonstrate different clinical presentations of peritoneal defects (peritoneal retraction pockets) and their anatomic relationships with the pelvic innervation, justifying the occurrence of some neurologic symptoms in association with these diseases.

DESIGN

Surgical demonstration of complete excision of different types of peritoneal retraction pockets and a comparison with a laparoscopic retroperitoneal cadaveric dissection of the pelvic innervation.

SETTING

Private hospital in Curitiba, Paraná, Brazil.

INTERVENTIONS

A pelvic peritoneal pocket is a retraction defect in the surface of the peritoneum of variable size and shapes [1]. The origin of defects in the pelvic peritoneum is still unknown [2]. It has been postulated that it is the result of peritoneal irritation or invasion by endometriosis, with resultant scarring and retraction of the peritoneum [3,4]. It has also been suggested that a retraction pocket may be a cause of endometriosis, where the disease presumably settles in a previously altered peritoneal surface [5]. These defects are shown in many studies to be associated with pelvic pain, dyspareunia, and secondary dysmenorrhea [1-4]. Some studies have shown that the excision of these peritoneal defect improves pain symptoms and quality of life [5]. It is important to recognize peritoneal pockets as a potential manifestation of endometriosis because in some cases, the only evidence of endometriosis may be the presence of these peritoneal defects [6]. In this video, we demonstrate different types of peritoneal pockets and their close relationship with pelvic anatomic structures. Case 1 is a 29-year-old woman, gravida 0, with severe dysmenorrhea and catamenial bowel symptoms (bowel distension and diarrhea/constipation) that were unresponsive to medical treatment. Imaging studies were reported as normal, and a laparoscopy showed a posterior cul-de-sac peritoneal pocket infiltrating the pararectal fossa, with extension to the lateral border of the rectum. Case 2 is a cadaveric dissection of a posterior cul-de-sac peritoneal pocket infiltrating the pararectal fossa, with extension to the pelvic sidewall. After dissection of the obturator fossa, we can observe that the pocket is close to the sacrospinous ligament, pudendal nerve, and some sacral roots. Case 3 is a 31-year-old woman, gravida 1, para 1, with severe dysmenorrhea that was unresponsive to medical treatment and catamenial bowel symptoms (catamenial bowel distention and diarrhea). Imaging studies were reported as normal and a laparoscopy showed left uterosacral peritoneal pocket infiltrating the pararectal fossa in close proximity to the rectal wall. Case 4 is a cadaveric dissection of the ovarian fossa and the obturator fossa showing the proximity between these structures. Case 5 is a 35-year-old woman, gravida 0, with severe dysmenorrhea that was unresponsive to medical treatment, referring difficulty, and pain when walking only during menstruation. A neurologic physical examination revealed weakness in thigh adduction, and the magnetic resonance imaging showed no signs of endometriosis. During laparoscopy, we found a peritoneal pocket infiltrating the ovarian fossa, with involvement in the area between the umbilical ligament and the uterine artery. This type of pocket can easily reach the obturator nerve. Because the obturator nerve and its branches supply the muscle and skin of the medial thigh [7,8], patients may present with thigh adduction weakness or difficulty ambulating [9,10]. Case 6 is a cadaveric dissection of the sacrospinous ligament and the pudendal nerve from a medial approach, between the umbilical artery and the iliac vessels. Case 7 is a 34-year-old woman, gravida 1, para 1, with severe dysmenorrhea and catamenial bowel symptoms as well as deep dyspareunia. The transvaginal ultrasound showed focal adenomyosis and a 2-cm nodule, 9-cm apart from the anal verge, affecting 30% of the bowel circumference. In the laparoscopy, we found a posterior cul-de-sac retraction pocket associated with a large deep endometriosis nodule affecting the vagina and the rectum. In all cases, endometriosis was confirmed by histopathology, and in a 6-month follow-up, all patients showed improvement of bowel, pain, and neurologic symptoms.

CONCLUSION

Peritoneal pockets can have different clinical presentations. Depending on the topography and deepness of infiltration, they can be the cause of some neurologic symptoms associated with endometriosis pain. With this video, we try to encourage surgeons to totally excise these lesions and raise awareness about the adjacent key anatomic structures that can be affected.

Laparoscopic Variants of Temporary Uterine Artery Ligation

OBJECTIVE

Laparoscopic uterine artery ligation may be performed during myomectomy or other uterine invasive procedures to reduce the amount of blood loss during surgery. In this video, the authors describe 3 different laparoscopic techniques to approach the uterine artery.

DESIGN

Step-by-step video demonstration of 3 different surgical techniques.

SETTING

Private hospital in Curitiba, Paraná, Brazil.

INTERVENTIONS

The main steps of uterine artery ligation are described in detail as well as different laparoscopic variants to this procedure.

ANTERIOR APPROACH

The impression of the uterine vessels can usually be seen anteriorly and laterally to the uterine cervix. After identification of the path of the uterine arteries, the peritoneum of the anterior cul-de-sac is opened over the vessels and the uterine artery is carefully dissected next to the lateral border of the uterine cervix. This dissection must be performed with extreme caution because the uterine veins are very close to the artery. Venous bleeding at this point of the dissection can be very difficult to control without ligating the vessels. After circumferential dissection of the artery, temporary occlusion is conducted using 2-0 polyester suture.

POSTERIOR APPROACH, LATERAL TO THE INFUNDIBULOPELVIC LIGAMENT

For ligation of the uterine artery posteriorly to the uterus and laterally to the pelvic infundibulum, opening of the peritoneum of the broad ligament should start immediately below the round ligament, parallel and medial to the external iliac vessels toward the base of the pelvic infundibulum. The avascular space is dissected by blunt dissection (traction and countertraction), identifying the lateral (external iliac vessels) and medial (pelvic infundibulum and the ureter attached to the peritoneum of the ovarian fossa) landmarks. The external iliac artery is dissected cranially to find the bifurcation of the common iliac artery and the internal iliac artery. The first medial branch of the anterior division of the internal iliac usually is the uterine artery. After circumferential dissection of the uterine artery, it may be ligated according to the same technique described above.

MEDIAL APPROACH

For the medial approach, the peritoneum should be opened medial to the infundibulopelvic ligament. The assistant grasps the infundibulopelvic ligament, creating a peritoneal tent. Immediately after broad ligament opening, anatomic landmarks are identified. First, the ureter is identified and medialized. For the identification of vascular anatomy, movement of the obliterated umbilical artery is made active, which reduces the risk of error to ligate the uterine artery. After circumferential dissection of the artery, it may be ligated according to the same technique described above.

CONCLUSION

Laparoscopic uterine artery ligation may be performed during laparoscopic myomectomy to reduce intraoperative blood loss. According to the position of the myomas within the uterus as well as the uterine volume, the surgeon may choose among 1 of the above-mentioned techniques to perform. This technique could also be applied to other types of invasive uterine procedures to reduce blood loss. Standardization of these techniques could help to reduce the laparoscopic learning curve.