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The Presacral Space

The presacral (retrorectal) space lies between the posterior rectum and mesorectum and the anterior sacrum and coccyx. It is the operative field of sacrocolpopexy, sacrohysteropexy and rectopexy. It contains the autonomic nerves that govern postoperative bladder, bowel and sexual function, and the presacral venous plexus, median sacral vessels and left common iliac vein, whose injury can cause rapid hemorrhage. It is also the anatomic basis of total mesorectal excision (TME), presacral neurectomy and retrorectal tumor surgery.

See Pelvic Vascular Anatomy, Pelvic Neuroanatomy, Bony Pelvic Anatomy, and Bowel Anatomy.

Boundaries and fascial planes​

The space is a potential space that opens readily once the peritoneum is incised at the promontory. It contains connective tissue, the superior hypogastric plexus and hypogastric nerves, the median and lateral sacral vessels, the presacral venous plexus, lymph nodes, and embryologic remnants that give rise to presacral tumors. The surgical plane within it differs from the whole anatomical compartment.[1][2]

RelationshipStructure and significance
AnteriorRectum and mesorectum enclosed by the mesorectal fascia
PosteriorSacrum/coccyx and their fascial covering, with vulnerable venous channels
InferiorPelvic floor and anorectal attachments
LateralPelvic sidewalls and adjacent autonomic nerves, ureters and iliac vessels
SuperiorContinuity toward the pelvic retroperitoneum; the rectal peritoneal reflection varies without a fixed S2–S3 roof

Cadaveric work describes three fascial layers. The proper rectal (mesorectal) fascia envelops the mesorectum and forms the anterior wall of the TME plane. The presacral fascia covers the median sacral vessels. The parietal pelvic fascia has two lamellae that ensheath the pelvic autonomic nerves, and recognizing its inner lamella is important for nerve preservation. The outer lamella and the presacral fascia confine the presacral space.[4] The posterior TME plane lies outside the mesorectal envelope and anterior to these layers. Exit through the parietal fascia risks the hypogastric nerves, and exit through the presacral fascia risks the presacral venous plexus. Terminology differs between studies, and “presacral fascia,” “parietal fascia” and “Waldeyer's fascia” are not identical labels in every publication.[3][4][5]

The rectosacral ligament (fascia) tethers the posterior rectum to the sacral fascia. In a 15-cadaver series, the rectosacral fascia was present in 8/10 male and 5/5 female specimens; among those 13, it arose at S2 (15%), S3 (38%) or S4 (46%) and joined the rectal fascia 3–5 cm above the anorectal junction.[5] Waldeyer's fascia, in the sense of the original description, is the fusion of the presacral and rectal fasciae forming the floor of the retrorectal space.[5] Stelzner and colleagues conclude that the ligament must be identified and transected for complete rectal mobilization, to avoid rectal perforation or accidental presacral dissection.[4] Division is done under vision when the planned mobilization requires it and is not part of every operation near the promontory. Blind posterior stripping can tear vessels or leave the intended plane.[5][16] The deep anococcygeal ligament, with the presacral fascia, probably helps position the anorectum relative to the coccyx.[24]

Vascular structures​

  • Median sacral artery and veins: descend near the midline, but position and branching vary. In 52 unembalmed female cadavers the median sacral artery lay a mean 4 mm (range 0–15 mm) from the promontory midpoint, and the vein 7 mm (range 0–17 mm). The vessels relevant to the planned exposure are identified before mesh sutures are placed.[6]
  • Lateral sacral vessels: connect the sacral region with the internal iliac systems.
  • Presacral venous plexus: thin venous channels on and within the sacral fascial or periosteal tissues communicate with the internal iliac system, the dorsal venous complex and the valveless vertebral (Batson) plexus. The plexus is not visible in routine rectal surgery until torn, and injury can cause severe bleeding because retracted veins are hard to clamp.
  • Left common iliac vein and tributaries: the left common iliac vein was the closest vessel cephalad (mean 27 mm, range 9–52 mm) and lateral (mean 22 mm, range 9–35 mm) to the promontory midpoint.[6] External iliac vein tributaries in the presacral area were found in 15 of 20 cadavers (75%).[10] These tributaries may limit exposure, including from the right.[6][8][9][10]

The anterior sacral foramina transmit sacral nerve branches and are distinct from the smaller venous channels that enter cancellous bone. Bleeding from a sacral foramen is not managed by driving a tack into the neural opening.[14][16]

Sacrocolpopexy fixation: identify the structures, not a preset rectangle​

The intended ligamentous fixation must account for the disc, sacral nerves and actual vessels. In 18 female cadavers, piriformis fascia marked the lateral boundary, but communicating veins crossed it; the authors advised avoiding fixation more than 1.5 cm from the sacral midline. In a separate 14-cadaver study, major iliac vessels did not cross a small region around the promontory midpoint, although the median sacral artery commonly traversed the midline. Neither observation establishes a complication-free zone.[31][32] A study of 176 CT-angiography-derived models from 182 datasets of Han Chinese women recommended a 30 × 20 mm avascular rectangle 10 mm below the promontory and alongside the median sacral artery. The rectangle is bounded by the median sacral artery, the left common iliac vein and the presacral venous plexus below.[7]

In an 18-female-cadaver study, median anterior longitudinal ligament thickness at the promontory was 1.9 mm (range 1.2–2.5 mm). The nearest measured point of the first sacral foramen was a median 26 mm inferior and 19 mm lateral to the reference midline. The authors advise anticipating the first sacral nerve about 2.5 cm below the promontory midpoint and 2 cm to the right of midline. The thin ligament calls for controlled suture depth, because fixation above the promontory risks discitis and osteomyelitis.[14]

The ligament and adjacent L5–S1 disc are confirmed before suturing. Penetration is limited, and neural foramina, vessels and disc tissue are avoided. For the full operation, see Sacrocolpopexy.[14][15]

Autonomic and somatic nerves​

The superior hypogastric plexus descends toward the promontory and divides into hypogastric nerves, which continue toward the inferior hypogastric plexuses. Pelvic splanchnic contributions usually arise from S2–S4. Small autonomic branches may be difficult to see even during careful dissection.[12] The plexus is predominantly sympathetic. Immunohistochemistry in four cadavers showed sympathetic and most likely postganglionic parasympathetic fibers.[25] It is the target of presacral neurectomy, which transects the plexus for refractory pelvic pain.[11]

Ripperda's 17-female-cadaver study illustrates the variability:

  • The superior hypogastric plexus lay a median 21.3 mm below the aortic bifurcation in 14 specimens (82.4%).[12] It measured a median 39.5 mm long and 9 mm wide, a flat band.[12]
  • The plexus was left of midline in 58.8%.[12]
  • Hypogastric nerves formed a median 23 mm below the promontory, with a 5–32 mm range.[12]
  • The nearest nerve branch to the middle uterosacral ligament lay a median 0.5 mm on the right and 0 mm on the left, with ranges of 0–4.5 and 0–27.5 mm, respectively.[12] “0–0.5 mm” is not the observed range.
  • The inferior hypogastric plexus formed 1–3 cm lateral to the rectum and upper vagina, with contributions from S3 and S4 in all specimens and from S2 in 47.1% of hemipelves. Bladder branches passed deep to the ureter, a uterine branch passed superficial to it, and an S4 branch attached directly to the lateral rectum in 53%.[12]

A six-cadaver study described a nerve-preserving approach. The peritoneum is incised longitudinally along the right common iliac artery and above the promontory, which exposes the anterior longitudinal ligament and the median sacral vessels while protecting the superior hypogastric plexus and the presacral area below the promontory.[13]

The first sacral nerve is a somatic neighbor behind the parietal fascia over piriformis, outside the usual presacral dissection space. Protect it during inferior or lateral fixation.[14]

Presacral hemorrhage​

Apply direct pressure, improve exposure and suction, call for help and coordinate resuscitation. Repeated blind clamping, deep suturing or traction can enlarge fragile venous tears. Further control follows the visible source and the patient's physiology, and a prolonged local technique is abandoned if the patient deteriorates.[16]

Conventional hemostatic measures often fail, and a systematic review classified the alternatives described, largely in small series. They include topical hemostatic agents, directed suturing of intact tissue, muscle-fragment or other tissue tamponade, and sterile thumbtacks placed into the sacral bone at the bleeding basivertebral vein.[16] Tacks carry migration and injury risks and are not driven into a neural foramen or placed blindly near vital structures. Indigo carmine is a diagnostic dye and not a hemostatic agent. Uncontrolled hemorrhage may need packing with a documented removal and re-exploration plan.[16]

See Vascular Management and Damage Control for resuscitation, physiological reassessment and escalation. Venous plexus bleeding and arterial pelvic trauma are different sources; arterial embolization does not automatically control a torn venous plexus.

Ventral mesh rectopexy buttresses the anterior rectum in the rectovaginal or rectoprostatic plane and fixes it to the sacral promontory; posterior rectopexy uses rectal mobilization with either suture fixation or posterior mesh.[28] Both share the vascular and neural hazards of sacrocolpopexy, and nerve injury can cause postoperative constipation and voiding dysfunction.[11] Presacral neurectomy transects the superior hypogastric plexus and has been used for refractory pelvic pain; constipation and voiding dysfunction are potential complications.[11] For endometriosis-associated midline pain, ESHRE's ungraded group statement describes benefit as an adjunct to conventional laparoscopic surgery and notes bleeding, urinary urgency and a painless first stage of labour.[27] Imaging reviews list complications of mesh sacrocolpopexy and rectopexy as bleeding, urinary tract injury or stricture, mesh extrusion or exposure with or without fistulization, bowel obstruction, and infection, abscess, discitis or osteomyelitis.[23]

Retrorectal masses​

MRI characterizes soft-tissue extent and relationships to the rectum, sacrum, nerves and spinal canal; CT adds information about bone, mineralization and fat. Retrorectal tumors are rare and heterogeneous, reflecting notochordal, hindgut, neural-crest, mesenchymal and osseous remnants. They are classified as congenital, neurogenic, osseous, inflammatory or miscellaneous, and most are benign although malignancy is not uncommon.[20] The differential includes developmental cysts (including epidermoid, dermoid and tailgut cysts), teratoma, anterior meningocele, nerve-sheath tumors, chordoma, other bone or soft-tissue tumors, abscess and hematoma.[1]

In a single-center series of 44 patients, 63.6% of tumors were congenital and 59.1% were benign.[18] The most common symptoms were sacrococcygeal or perianal pain (56.8%) and a mass (36.4%), and 8 of 9 patients with lower-limb symptoms had a malignant tumor.[18] Among 20 patients who had digital rectal examination, 15 (75%) had a palpable tumor; among 31 operated patients, 26 (83.9%) underwent a posterior approach.[18] In another series of 42 operated patients, 26% were asymptomatic, and the posterior approach was used mainly for congenital tumors and the anterior approach for acquired tumors.[19] Complete resection was achieved in all benign tumors and in 76% of malignant tumors, and survival of patients with malignant tumors was better when resection was complete.[19] MRI is the modality for soft-tissue extent. A 2026 international expert consensus recommends selective image-guided transperineal or parasacral biopsy for high-risk lesions when histology would alter management; the treating team plans the route with possible tract excision in mind if resection follows.[29][30]

FindingPlanning consequence
Developmental cyst, including tailgut cystSpecialist assessment balances symptoms, MRI risk features, infection and operative risk. A 2026 international expert consensus supports surveillance for carefully selected asymptomatic, low-risk cystic lesions; excision remains a common option.[29] In a selected series of 17 surgically treated tailgut cysts, 1 contained malignancy (5.9%).[26]
Suspected anterior meningocele or spinal communicationObtain appropriate spinal/neurosurgical assessment before an invasive procedure; do not puncture an uncharacterized cystic lesion.
Solid, invasive or suspicious lesionPlan biopsy route and definitive treatment with the relevant tumor team, including how a biopsy tract would be managed.

These distinctions are supported by the imaging review; the approach should be tailored to the suspected diagnosis and anatomy.[1]

Chordoma arises from notochordal remnants and has a propensity for the sacrum.[22] Currarino syndrome classically combines a presacral mass, sacral defect and anorectal malformation. Many familial cases are autosomal dominant and involve MNX1 (formerly HLXB9), but the triad may be incomplete and sporadic cases may lack an identified MNX1 variant.[33] Presacral teratomas in this anomaly carry an inherent risk of malignant transformation, which shapes counseling and follow-up.[21]

For primary localized chordoma, the 2026 Global Chordoma Consensus updates the 2015 statement and emphasizes experienced multidisciplinary care, site-specific planning for maximally safe surgery followed by high-dose, highly conformal radiotherapy, and long-term, risk-adapted follow-up. It should not be reduced to “sacrectomy is always definitive treatment.” The operative plan must consider achievable disease control and neurological and reconstructive morbidity.[17]

The level of a mass relative to S3 helps plan anterior, posterior or combined access, but size, vascularity, invasion, neural involvement and previous surgery also matter. Sacrectomy and urinary diversion are added when required by the disease and planned resection; neither is inherent to every posterior pelvic exenteration.[1] For the ureteral and bladder injury risk and reconstruction choices during exenterative and extended pelvic tumor resection, see Pelvic Tumor Resection.

References​

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2. Fritsch H. "Topography and Subdivision of the Pelvic Connective Tissue in Human Fetuses and in the Adult." Surg Radiol Anat. 1994;16(3):259–265. doi:10.1007/BF01627680

3. Zhang C, Ding ZH, Li GX, et al. "Perirectal Fascia and Spaces: Annular Distribution Pattern Around the Mesorectum." Dis Colon Rectum. 2010;53(9):1315–1322. doi:10.1007/DCR.0b013e3181e74525

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24. Jin ZW, Hata F, Jin Y, et al. The anococcygeal ligaments: cadaveric study with application to our understanding of incontinence in the elderly. Clin Anat. 2015;28(8):1039–1047. doi:10.1002/ca.22629.

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32. Bhandari Randhawa S, King LA, Florian-Rodriguez ME, et al. "Anatomic Zone of Safety of the Presacral Space." Urogynecology (Phila). 2026;32(6):745–752. doi:10.1097/SPV.0000000000001736

33. Dworschak GC, Reutter HM, Ludwig M. "Currarino Syndrome: A Comprehensive Genetic Review of a Rare Congenital Disorder." Orphanet J Rare Dis. 2021;16:167. doi:10.1186/s13023-021-01799-0