Skip to main content

The Presacral Space

The presacral or retrorectal region lies between the posterior rectum/mesorectum and the anterior sacrum and coccyx. It matters in prolapse fixation, rectal mobilization, pelvic reconstruction and retrorectal tumor surgery. An average anatomical distance is an orientation aid, not a guarantee of safe dissection or fixation.[1][6][14]

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

Boundaries and fascial planes​

The clinical region contains connective tissue and important neurovascular structures; it is not an empty chamber. A potential surgical plane within it must be distinguished 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 is variable and is not a universal S2–S3 roof

The plane used for posterior total mesorectal excision lies outside the mesorectal envelope and anterior to the posterior fascial covering. Fascial terminology and lamellar descriptions differ between studies; “presacral fascia,” “parietal fascia” and “Waldeyer's fascia” should not be treated as identical labels in every publication.[3][4][5]

The rectosacral attachment tethers the posterior rectum to the sacral fascia. Divide it under vision when the intended rectal mobilization requires release. This is not a required maneuver in every operation near the promontory. Blind posterior stripping can tear vessels or leave the intended dissection plane.[5][16]

Vascular structures​

  • Median sacral artery and veins: descend near the midline, but position and branching vary. Identify the vessels relevant to the proposed exposure and fixation.
  • Lateral sacral vessels: connect the sacral region with the internal iliac systems.
  • Presacral venous plexus: thin venous channels on and within the sacral fascial/periosteal tissues communicate with the pelvic and vertebral venous systems. Injury can cause severe bleeding.
  • Left common iliac vein and tributaries: lie close to the promontory; their position and smaller tributaries may limit the available exposure. A right-sided approach does not establish an avascular field.[6][8][9][10]

The anterior neural sacral foramina transmit sacral nerve branches. Distinguish them from smaller venous channels entering cancellous bone. The shorthand “bleeding sacral foramen” does not make a neural opening a suitable target for a tack or packing material.[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. A study of 176 CT-derived models proposed a 30 × 20 mm rectangle beginning 10 mm below the promontory. This is a study-specific anatomical proposal; it was not a clinical validation of complication-free fixation, and should not be reproduced as a universally safe zone.[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. These measurements describe a distribution; they do not prescribe a safe bite depth or a boundary beyond which nerve injury begins.[14]

Confirm the ligament and adjacent L5–S1 disc rather than assuming the most prominent palpable structure is a safe suture site. Limit penetration and avoid neural foramina, vessels and disc tissue. 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]

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

  • The superior hypogastric plexus was left of midline in 58.8%, rather than invariably left-sided.
  • Hypogastric nerves formed a median 23 mm below the promontory, with a 5–32 mm range.
  • 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. “0–0.5 mm” is not the observed range.[12]

A deliberate nerve-preserving exposure can reduce avoidable injury, but a fixed right-sided incision does not guarantee preservation of bowel, bladder or sexual function. Postoperative dysfunction is multifactorial, and the available outcome literature does not support attributing every symptom to one transected plexus.[11][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. Choose further control according to the visible source and patient physiology; do not persist with a prolonged local technique while the patient deteriorates.[16]

Topical hemostatic materials, directed suturing of appropriate intact tissue, tissue tamponade and other specialist techniques have been described, largely in small series. Tacks carry migration and injury risks and must not be driven into a neural sacral foramen or placed blindly near vital structures. Indigo carmine is a diagnostic dye, not a hemostatic agent. Packing with a documented removal/re-exploration plan may be needed for uncontrolled hemorrhage.[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.

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. The differential includes developmental cysts, teratoma, anterior meningocele, nerve-sheath tumors, chordoma, other bone/soft-tissue tumors, abscess and hematoma. Published surgical-series proportions are not population incidence estimates.[1]

FindingPlanning consequence
Developmental cyst, including tailgut cystSpecialist assessment balances symptoms, imaging concern, infection and operative risk. Excision is commonly considered; selected apparently benign incidental cysts have also been observed. A fixed “6% transformation risk” does not establish mandatory surgery for every incidental lesion.
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]

For primary localized chordoma, the 2026 Global Chordoma Consensus updates the 2015 statement and emphasizes experienced multidisciplinary care, site-specific surgery and radiotherapy planning, and long-term follow-up. It should not be reduced to “sacrectomy is always definitive treatment.” The operative plan must consider achievable disease control and neurological/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]

References​

1. Hain KS, Pickhardt PJ, Lubner MG, Menias CO, Bhalla S. "Presacral Masses: Multimodality Imaging of a Multidisciplinary Space." Radiographics. 2013;33(4):1145–1167. doi:10.1148/rg.334115171

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

4. Stelzner S, Heinze T, Nikolouzakis TK, et al. "Perirectal Fascial Anatomy: New Insights Into an Old Problem." Dis Colon Rectum. 2021;64(1):91–102. doi:10.1097/DCR.0000000000001778

5. García-Armengol J, García-Botello S, Martinez-Soriano F, Roig JV, Lledó S. "Review of the Anatomic Concepts in Relation to the Retrorectal Space and Endopelvic Fascia: Waldeyer's Fascia and the Rectosacral Fascia." Colorectal Dis. 2008;10(3):298–302. doi:10.1111/j.1463-1318.2007.01472.x

6. Wieslander CK, Rahn DD, McIntire DD, et al. "Vascular Anatomy of the Presacral Space in Unembalmed Female Cadavers." Am J Obstet Gynecol. 2006;195(6):1736–1741. doi:10.1016/j.ajog.2006.07.045

7. Shen P, Peng C, Zhang W, et al. "Exploration of the Safe Suture Area of the Presacral Space in Sacrocolpopexy by 3-Dimensional (3D) Models Reconstructed From CT." Int Urogynecol J. 2021;32(4):865–870. doi:10.1007/s00192-020-04645-2

8. Baqué P, Karimdjee B, Iannelli A, et al. "Anatomy of the Presacral Venous Plexus: Implications for Rectal Surgery." Surg Radiol Anat. 2004;26(5):355–358. doi:10.1007/s00276-004-0258-7

9. Zurcher KS, Staack SO, Spencer EB, et al. "Venous Anatomy and Collateral Pathways of the Pelvis: An Angiographic Review." Radiographics. 2022;42(5):1532–1545. doi:10.1148/rg.220012

10. Kanjanasilp P, Ng JL, Kajohnwongsatit K, et al. "Anatomical Variations of Iliac Vein Tributaries and Their Clinical Implications During Complex Pelvic Surgeries." Dis Colon Rectum. 2019;62(7):809–814. doi:10.1097/DCR.0000000000001335

11. Huber SA, Northington GM, Karp DR. "Bowel and Bladder Dysfunction Following Surgery Within the Presacral Space: An Overview of Neuroanatomy, Function, and Dysfunction." Int Urogynecol J. 2015;26(7):941–946. doi:10.1007/s00192-014-2572-x

12. Ripperda CM, Jackson LA, Phelan JN, Carrick KS, Corton MM. "Anatomic Relationships of the Pelvic Autonomic Nervous System in Female Cadavers: Clinical Applications to Pelvic Surgery." Am J Obstet Gynecol. 2017;216(4):388.e1–388.e7. doi:10.1016/j.ajog.2016.12.002

13. Shiozawa T, Huebner M, Hirt B, Wallwiener D, Reisenauer C. "Nerve-Preserving Sacrocolpopexy: Anatomical Study and Surgical Approach." Eur J Obstet Gynecol Reprod Biol. 2010;152(1):103–107. doi:10.1016/j.ejogrb.2010.05.009

14. Florian-Rodriguez ME, Hamner JJ, Corton MM. "First Sacral Nerve and Anterior Longitudinal Ligament Anatomy: Clinical Applications During Sacrocolpopexy." Am J Obstet Gynecol. 2017;217(5):607.e1–607.e4. doi:10.1016/j.ajog.2017.07.008

15. Giraudet G, Protat A, Cosson M. "The Anatomy of the Sacral Promontory: How to Avoid Complications of the Sacrocolpopexy Procedure." Am J Obstet Gynecol. 2018;218(4):457.e1–457.e3. doi:10.1016/j.ajog.2017.12.236

16. Celentano V, Ausobsky JR, Vowden P. Surgical management of presacral bleeding. Ann R Coll Surg Engl. 2014;96:261–265. doi:10.1308/003588414X13814021679951.

17. Radaelli S, Frezza AM, Fossati P, et al. Global consensus on the management of primary localized chordoma. JAMA Oncol. Published online July 9, 2026. doi:10.1001/jamaoncol.2026.2054.