Subarticular Thecal Sac Indentation

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 14 min read
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Article Summary

Subarticular thecal sac indentation is a radiologic finding on spinal imaging (MRI, CT) characterized by focal inward deformation of the thecal (dural) sac at the subarticular (lateral recess) zone. It occurs when structures—such as herniated disc material, hypertrophied facet joints, thickened ligamentum flavum, osteophytes, or other soft tissue masses—encroach upon the dural sac, causing effacement of cerebrospinal fluid in that region on axial images ....

Key Takeaways

  • This article explains Anatomy of the Thecal Sac in simple medical language.
  • This article explains Types of Subarticular Thecal Sac Indentation in simple medical language.
  • This article explains Causes in simple medical language.
  • This article explains Symptoms in simple medical language.
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Definition

Subarticular thecal sac indentation is a radiologic finding on spinal imaging (, ) characterized by focal inward deformation of the thecal (dural) sac at the subarticular (lateral recess) zone. It occurs when structures—such as material, hypertrophied facet joints, thickened ligamentum flavum, osteophytes, or other soft tissue masses—encroach upon the dural sac, causing effacement of cerebrospinal fluid in that region on axial images .

of the Thecal Sac

Structure & Location:
The thecal sac (or dural sac) is a tubular sheath of dura mater that encloses the and cauda equina within the vertebral canal, extending from the foramen magnum to the level of the second sacral (S2) .

Origin & Termination:
It arises as dura mater exits the at the foramen magnum, surrounding the spinal cord. Inferiorly, it tapers at S2, where it anchors to the via the filum terminale externum .

Blood Supply:
The spinal dura receives arterial blood primarily from the anterior and posterior radicular —branches of segmental spinal arteries—that anastomose around the nerve roots and dura .

Nerve Supply:
A dense ventral dural plexus, formed by the sinuvertebral nerves ( meningeal nerves), the posterior longitudinal plexus, and radicular branches of segmental arteries, innervates the anterior and lateral spinal dura; the dorsal dura has fewer, smaller nerves derived from this plexus .

Functions:

  1. Support Spinal Vasculature: Provides a scaffold for spinal blood vessels.

  2. Mechanical Cushioning: Works with CSF to absorb shocks and prevent tissue injury.

  3. CSF Containment: Forms a continuous cavity through which CSF circulates.

  4. Nutrient/Waste Transport: Maintains CSF volume for nutrient delivery and waste removal.

  5. Barrier Function: Protects against and hemorrhage.

  6. Dural Root Sheaths: Extends along spinal nerves forming dural root sleeves as they exit the canal.

Types of Subarticular Thecal Sac Indentation

  1. Subarticular Disc Bulge: Broad-based protrusion indenting the thecal sac ventrally.

  2. Subarticular Disc Protrusion: Focal herniation pressing into the lateral recess.

  3. Subarticular Disc Extrusion: Extruded nucleus pulposus penetrating the thecal sac.

  4. Facet Joint : Overgrowth of facet joints compressing the lateral recess.

  5. Ligamentum Flavum Thickening: Hypertrophied ligament encroaching on the dural sac.

  6. Synovial Cyst: Fluid‐filled cyst from the facet joint indenting thecal sac.

  7. Formation: Bony spurs from vertebral endplates narrowing the recess.

  8. Postoperative Epidural : Scar tissue after surgery causing indentation.

  9. Epidural Hematoma: Blood collection compresses the thecal sac acutely.

  10. Epidural : Infected material indenting the sac.

  11. Metastatic Epidural : Neoplastic tissue in the epidural space.

  12. Paget’s Disease of Bone: Bone remodeling leading to canal narrowing.

  13. ‐Related Bleeds: Spontaneous hematoma from blood disorders.

  14. Vascular Anomalies: Arteriovenous malformation masses compressing dura.

  15. Traumatic Bony Fragments: pieces indenting thecal sac.

  16. Developmental Subarticular : short pedicles narrow recess.

  17. Achondroplasia: bone growth disorder causing canal narrowing.

  18. Epidural Lipomatosis: Excess fat deposition compresses thecal sac.

  19. Degenerative Spondylotic Ridges: Hypertrophic bony ridges from .

  20. Tarlov Cysts: Perineural cysts may indent the lateral aspect of the sac.

Causes

  1. Herniated Disc (bulge, protrusion, extrusion, sequestration)

  2. Degenerative (central/subarticular)

  3. Facet Arthrosis & Hypertrophy

  4. Ligamentum Flavum Thickening

  5. Synovial Cyst Formation

  6. Osteophyte Spurs

  7. Disc Extrusion into Recess

  8. Disc Sequestration

  9. Spinal Epidural Hematoma

  10. Epidural Abscess/Infection

  11. Epidural Neoplasms/Metastases

  12. Paget’s Disease of Bone

  13. Coagulopathy / Anticoagulation Therapy

  14. Vascular Anomalies

  15. Minor Vertebral /Fracture Fragments

  16. Congenital Pedicle Shortening

  17. Achondroplasia

  18. Epidural Lipomatosis

  19. Degenerative Spondylotic Ridges

  20. Tarlov (Perineural) Cysts

Symptoms

  2. Radicular radiating into arms/legs

  3. Numbness or tingling in limbs

  4. Muscle weakness

  5. Neurogenic claudication (leg cramping when walking)

  6. Burning pain in buttocks/legs

  7. Leg/foot numbness

  8. Pins-and-needles sensation

  9. Leg/foot weakness

  10. Reduced deep tendon reflexes

  11. Bowel/bladder dysfunction (incontinence)

  12. Saddle anesthesia

  13. Sexual dysfunction

  14. Symptoms improve when bending forward

  15. Paraspinal muscle spasm

  16. Gait disturbance/unsteady walking

  17. Clonus or hyperreflexia (in cord compression)

  18. Muscle atrophy (chronic cases)

  19. Neck pain/stiffness (cervical level)

  20. Dysphagia or swallowing difficulty (high cervical compression)

Diagnostic Tests

  1. X-rays (plain radiography to assess bony anatomy)

  2. Magnetic Resonance Imaging (MRI) for detailed soft-tissue evaluation

  3. Computed Tomography (CT) scan for bone detail

  4. CT Myelography (contrast-enhanced CT)

  5. Myelogram with fluoroscopic contrast

  6. Electromyography (EMG) for nerve function assessment

  7. Nerve Conduction Studies (NCS)

  8. Somatosensory Evoked Potentials (SSEP)

  9. Neurological Examination (motor strength, sensation, reflexes)

  10. Medical History & Symptom Review

  11. Laboratory Tests (CBC, ESR, CRP) to rule out infection/inflammation

  12. Bone Scan (nuclear imaging) for metastases or bone disease

  13. Provocative Discography to localize symptomatic discs

  14. Dynamic (Flexion-Extension) X-rays for instability

  15. CT–Myelogram for detailed root sleeve visualization

  16. Quantitative MRI Measurements (canal diameter, cross-sectional area)

  17. Selective Nerve Root Block (diagnostic injection)

  18. Urodynamic Studies for bladder dysfunction

  19. Physical Performance Tests (treadmill, walking distance)

  20. Psychological Assessment (Waddell’s signs, CBT evaluation)

Non-Pharmacological Treatments

  1. Tailored Physical Therapy programs of stretching & strengthening

  2. Soft Tissue Massage to reduce muscle tension

  3. Joint Mobilization techniques for spine segments

  4. Spinal Traction Therapy (mechanical/manual)

  5. Core Stabilization Exercises (e.g., bird-dog, bridges)

  6. Knee-to-Chest Stretch for neural relief

  7. Posterior Pelvic Tilt (Bridge)

  8. Neural Tension Exercises (leg neural stretch)

  9. Hip-Flexor Stretch

  10. Lower Trunk Rotation

  11. Aquatic Therapy for reduced axial load

  12. Low-Impact Aerobic Exercise (walking, cycling, swimming)

  13. Supervised Weight-Loss Programs

  14. Lumbosacral Bracing/Corsets

  15. Gait Aids (cane, walker)

  16. Ergonomic & Postural Education

  17. Chiropractic Manipulation

  18. Acupuncture

  19. TENS (Transcutaneous Electrical Nerve Stimulation)

  20. Heat Therapy (moist heat packs)

  21. Cold Therapy (ice packs)

  22. Ultrasound Therapy

  23. NMES (Neuromuscular Electrical Stimulation)

  24. Myofascial Release manual technique

  25. Yoga for flexibility & core strength

  26. Pilates for posture & core control

  27. Tai Chi for balance & coordination

  28. Massage Therapy

  29. Activity Modification to avoid aggravating positions

  30. Self-Management Education strategies

Drugs

  1. Ibuprofen (NSAID)

  2. Naproxen (NSAID)

  3. Diclofenac (NSAID)

  4. Aspirin

  5. Acetaminophen

  6. Celecoxib (COX-2 inhibitor)

  7. Cyclobenzaprine (muscle relaxant)

  8. Baclofen

  9. Tizanidine

  10. Gabapentin

  11. Pregabalin

  12. Duloxetine (SNRI)

  13. Nortriptyline (TCA)

  14. Prostaglandin-based agents

  15. Methylcobalamin

  16. Epidural methylprednisolone (steroid injection)

  17. Epidural dexamethasone

  18. Carbamazepine

  19. Oxcarbazepine

  20. Lidocaine patch (topical)

Surgeries

  1. Open Laminectomy (decompressive laminectomy)

  2. Minimally Invasive Laminectomy

  3. Laminotomy (partial lamina removal)

  4. Foraminotomy

  5. Discectomy (microdiscectomy)

  6. Spinal Fusion (instrumented)

  7. Ligamentum Flavum Resection

  8. Endoscopic Decompression

  9. Microsurgical Laminoplasty Wikipedia

  10. Cervical Laminoplasty Cleveland Clinic

 Preventions

  1. Maintain a healthy weight to reduce spinal load.

  2. Regular low-impact exercise (walking, swimming).

  3. Good posture when sitting/standing.

  4. Ergonomic workstation setup.

  5. Core strengthening (e.g., Pilates).

  6. Proper lifting techniques—bend knees, keep back straight.

  7. Regular stretching to maintain flexibility.

  8. Take breaks to avoid prolonged sitting or standing.

  9. Use lumbar support cushions when sitting.

  10. Follow ergonomic guidelines for driving and computer use.

When to See a Doctor

See a healthcare provider promptly if you experience:

  • Sudden weakness in legs or arms

  • Loss of bladder or bowel control

  • Saddle anesthesia (numbness in groin)

  • Severe, unrelenting pain at rest or at night

  • Fever or signs of infection

  • History of cancer with new back pain

  • Progressive neurological deficits (e.g., increasing weakness, reflex changes)

Frequently Asked Questions

  1. What exactly is subarticular thecal sac indentation?
    It’s when nearby structures push into the lateral part of your spinal canal, indenting the dural sac that contains your spinal cord or nerves.

  2. How is it diagnosed?
    Primarily by MRI or CT myelography, which show detailed images of the spinal canal and any indentations.

  3. Can mild indentations cause symptoms?
    Mild cases often are painless and found incidentally. Symptoms depend on severity and nerve involvement.

  4. What symptoms should alert me?
    Look for radicular pain, numbness, muscle weakness, and neurogenic claudication (leg cramps with walking).

  5. Is it the same as spinal stenosis?
    It’s a form of lateral recess stenosis—spinal stenosis normally refers to central canal narrowing, while subarticular indentations affect the lateral recess.

  6. What non-surgical treatments help most?
    Physical therapy, core-strengthening exercises, posture correction, and low-impact aerobic activity are first-line.

  7. When are injections used?
    Epidural steroid injections can ease inflammation and pain for weeks to months but don’t fix the underlying indentation.

  8. Are opioids ever prescribed?
    They may be used short-term for severe pain but carry risks of dependence and side effects.

  9. When is surgery recommended?
    If there’s progressive neurological deficit, intractable pain unresponsive to conservative care, or cauda equina syndrome signs.

  10. What surgical options exist?
    Decompressive laminectomy, laminotomy, discectomy, endoscopic decompression, and sometimes fusion if instability is present.

  11. What are the risks of surgery?
    Infection, bleeding, nerve injury, CSF leak, instability requiring fusion, and anesthesia risks.

  12. Can indentations recur after surgery?
    Yes—scar tissue (epidural fibrosis) or further degeneration can cause recurrent symptoms.

  13. How can I prevent subarticular stenosis?
    Maintain healthy weight, exercise regularly, practice good posture, and avoid heavy spinal loads.

  14. Is physical therapy enough?
    Many patients gain substantial relief; severe cases sometimes still require surgery.

  15. What’s the long-term outlook?
    With appropriate management, most achieve stable symptom control. Ongoing exercise and weight management help maintain improvements.

Disclaimer: Each person’s journey is unique, treatment plan, life style, food habit, hormonal condition, immune system, chronic disease condition, geological location, weather and previous medical  history is also unique. So always seek the best advice from a qualified medical professional or health care provider before trying any treatments to ensure to find out the best plan for you. This guide is for general information and educational purposes only. Regular check-ups and awareness can help to manage and prevent complications associated with these diseases conditions. If you or someone are suffering from this disease condition bookmark this website or share with someone who might find it useful! Boost your knowledge and stay ahead in your health journey. We always try to ensure that the content is regularly updated to reflect the latest medical research and treatment options. Thank you for giving your valuable time to read the article.

The article is written by Team Rxharun and reviewed by the Rx Editorial Board Members

Last Updated: May 03, 2025.

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  23. https://www.niddk.nih.gov/health-information/kidney-disease
  24. https://www.kidney.org/kidney-topics/chronic-kidney-disease-ckd
  25. https://www.kidneyfund.org/all-about-kidneys/types-kidney-diseases
  26. https://www.aad.org/about/burden-of-skin-disease
  27. https://www.usa.gov/federal-agencies/national-institute-of-arthritis-musculoskeletal-and-skin-diseases
  28. https://www.cdc.gov/niosh/topics/skin/default.html
  29. https://www.mayoclinic.org/diseases-conditions/brain-tumor/symptoms-causes/syc-20350084
  30. https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Understanding-Sleep
  31. https://www.cdc.gov/traumaticbraininjury/index.html
  32. https://www.skincancer.org/
  33. https://illnesshacker.com/
  34. https://endinglines.com/
  35. https://www.jaad.org/
  36. https://www.psoriasis.org/about-psoriasis/
  37. https://books.google.com/books?
  38. https://www.niams.nih.gov/health-topics/skin-diseases
  39. https://cms.centerwatch.com/directories/1067-fda-approved-drugs/topic/292-skin-infections-disorders
  40. https://www.fda.gov/files/drugs/published/Acute-Bacterial-Skin-and-Skin-Structure-Infections—Developing-Drugs-for-Treatment.pdf
  41. https://dermnetnz.org/topics
  42. https://www.aaaai.org/conditions-treatments/allergies/skin-allergy
  43. https://www.sciencedirect.com/topics/medicine-and-dentistry/occupational-skin-disease
  44. https://aafa.org/allergies/allergy-symptoms/skin-allergies/
  45. https://www.nibib.nih.gov/
  46. https://www.nei.nih.gov/
  47. https://en.wikipedia.org/wiki/List_of_skin_conditions
  48. https://en.wikipedia.org/?title=List_of_skin_diseases&redirect=no
  49. https://en.wikipedia.org/wiki/Skin_condition
  50. https://oxfordtreatment.com/
  51. https://www.nidcd.nih.gov/health/
  52. https://consumer.ftc.gov/articles/w
  53. https://www.nccih.nih.gov/health
  54. https://catalog.ninds.nih.gov/
  55. https://www.aarda.org/diseaselist/
  56. https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets
  57. https://www.nibib.nih.gov/
  58. https://www.nia.nih.gov/health/topics
  59. https://www.nichd.nih.gov/
  60. https://www.nimh.nih.gov/health/topics
  61. https://www.nichd.nih.gov/
  62. https://www.niehs.nih.gov
  63. https://www.nimhd.nih.gov/
  64. https://www.nhlbi.nih.gov/health-topics
  65. https://obssr.od.nih.gov/
  66. https://www.nichd.nih.gov/health/topics
  67. https://rarediseases.info.nih.gov/diseases
  68. https://beta.rarediseases.info.nih.gov/diseases
  69. https://orwh.od.nih.gov/

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Doctor visit helper

Prepare before seeing a doctor

A simple rural-patient checklist to help you explain symptoms clearly, ask better questions, and avoid unsafe self-treatment.

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Orthopedic doctor, spine specialist, neurologist, or physiotherapist depending on severity.

What to tell the doctor

  • Mark pain area and whether pain travels to leg.
  • Write numbness, weakness, bladder/bowel problem, fever, injury, or night pain if present.
  • Bring previous X-ray/MRI and medicine list.

Questions to ask

  • Is this muscle pain, disc problem, nerve pressure, arthritis, infection, or another cause?
  • Do I need X-ray or MRI now?
  • Which activities should I avoid and which exercises are safe?
  • When can I return to work?

Tests to discuss

  • Spine and neurological examination
  • Straight leg raise or similar nerve tension tests
  • X-ray if trauma/deformity/chronic pain is suspected
  • MRI if leg weakness, sciatica, or red flags are present

Avoid these mistakes

  • Avoid heavy lifting, long bed rest, and untrained spinal manipulation.
  • Avoid NSAIDs if ulcer, kidney disease, blood thinner use, pregnancy, or allergy unless doctor says safe.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
  • Use comfortable posture and gentle movement as tolerated.
  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Orthopedic / spine specialist, physical medicine doctor, or qualified clinician
Tests to discuss with doctor
  • Neurological examination for leg power, sensation, reflexes, and straight leg raise
  • X-ray only if injury, deformity, long-lasting pain, or doctor suspects bone problem
  • MRI discussion if severe nerve symptoms, weakness, bladder/bowel problem, or persistent symptoms
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?
  • Is physiotherapy, posture correction, or activity modification needed?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Subarticular Thecal Sac Indentation

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.