Lateral Side Thecal Sac Indentation

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 15 min read
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Article Summary

Lateral side thecal sac indentation refers to a focal inward pressing or flattening along the side portion of the thecal sac—the membrane-lined tube of dura mater that surrounds and protects the spinal cord and nerve roots. On imaging (most commonly MRI), a bulging disc, enlarged facet joint, thickened ligament, or other structure narrows the lateral recess, creating a visible “dent” in the normally smooth contour...

Key Takeaways

  • This article explains Anatomy of the Thecal Sac in simple medical language.
  • This article explains Types of Lateral Side Thecal Sac Indentation in simple medical language.
  • This article explains Causes in simple medical language.
  • This article explains Symptoms in simple medical language.
Educational health guideWritten for patient understanding and clinical awareness.
Reviewed content workflowUse writer and reviewer profiles for stronger trust.
Emergency safety firstUrgent warning signs are highlighted below.
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Definition

Lateral side thecal sac indentation refers to a focal inward pressing or flattening along the side portion of the thecal sac—the membrane-lined tube of dura mater that surrounds and protects the and nerve roots. On imaging (most commonly ), a bulging disc, enlarged facet joint, thickened , or other structure narrows the lateral recess, creating a visible “dent” in the normally smooth contour of the thecal sac. This indentation may or may not compress nerve roots, depending on its severity. RadiopaediaWikipedia

of the Thecal Sac

Structure and Location

The thecal sac, also called the dural sac, is a tough, fibrous sleeve—the outer dura mater—that begins at the foramen magnum (where the exits the ) and extends down to the level of the second sacral (S2). It encases the spinal cord in the upper spine and the cauda equina (a bundle of nerve roots) in the lower spine, floating within the epidural space. Wikipedia

Origin and Insertion

Unlike muscles, the thecal sac has no origin or insertion points; rather, it attaches loosely to surrounding via small (meningovertebral ligaments) that span from the dura to the posterior vertebral elements and intervertebral foramina. Jocn Journal

Blood Supply

Blood vessels supplying the thecal sac’s dura mater arise from segmental meningeal , including radicular arteries that accompany spinal nerve roots, and small branches of the anterior and posterior spinal arteries. Venous drainage occurs through the internal vertebral (epidural) venous plexus. NCBI

Nerve Supply

The dura of the thecal sac is innervated by meningeal (sinuvertebral) nerves, which branch off the spinal nerves soon after they exit the intervertebral foramina. These nerves carry signals when the dura is stretched or compressed. Wikipedia

Functions

  1. Protection: Shields the spinal cord and nerve roots from mechanical injury.

  2. CSF Containment: Holds cerebrospinal fluid, which cushions neural tissues.

  3. Buoyancy: Allows the spinal cord to “float,” reducing impact of gravity.

  4. Nutrient Delivery: Facilitates exchange of nutrients and waste via CSF.

  5. Conduit: Provides a pathway for dural nerve root sheaths along exiting nerves.

  6. Injection Access: Enables safe access for or intrathecal drug delivery. ScienceDirect

Types of Lateral Side Thecal Sac Indentation

  1. (Grade 1): Slight thecal sac concavity without nerve root flattening.

  2. (Grade 2): Noticeable indent with some nerve root contact or displacement.

  3. (Grade 3): Sharp, obliterated margins of the thecal sac with clear nerve root compression.

  4. Location Subtypes:

    • Lateral Recess : Involves the area just medial to the neural foramen.

    • Foraminal Stenosis: Occurs at the intervertebral foramen where the nerve exits.

    • Extraforaminal (Far-Lateral) Compression: Beyond the foramen, lateral to the pedicle. RadiopaediaPMC

Causes

  1. Disc Herniation: Bulging nucleus pulposus indenting the dura.

  2. Facet Joint : Enlarged joints narrowing the lateral canal.

  3. Ligamentum Flavum Thickening: Stiff ligament pushing inward.

  4. Formation: Bone spurs from degeneration.

  5. : Vertebral slippage narrowing space.

  6. Epidural Lipomatosis: Excess fat in the epidural space.

  7. Spinal Tumors or Cysts: Mass effect against the dura.

  8. Epidural : Inflammatory compressing sac.

  9. Post-surgical Scar Tissue: in the epidural space.

  10. -induced Hematoma: Blood collection pressing on thecal sac.

  11. Canal Narrowing: Developmental stenosis.

  12. Paget Disease: Abnormal bone growth.

  13. Pannus: Inflamed tissue in facet joints.

  14. Calcified Disc Material: Hard disc fragments.

  15. Spinal Displacement: Bone fragment impingement.

  16. Synovial Cysts: Fluid-filled joint outpouchings.

  17. Infectious Granuloma: Focal mass from .

  18. Scheuermann’s Kyphosis: Vertebral wedging altering canal shape.

  19. Obesity-related Fat Deposition: Excess fat in epidural space.

  20. Degenerative Disc Disease: Loss of disc height changing canal geometry. RadiopaediaPMC

Symptoms

  1. Low Back Pain: Aching at the indent level.

  2. Leg Pain (Radiculopathy): Sharp or burning down the leg.

  3. Numbness or Tingling: “Pins and needles” in leg/foot.

  4. Weakness: Difficulty lifting the foot or leg.

  5. Neurogenic Claudication: Cramping after walking short distances.

  6. Altered Reflexes: Reduced knee or ankle reflex.

  7. Gait Disturbance: Unsteady or wide-based walk.

  8. Balance Problems: Feeling off-balance.

  9. Muscle Cramps: In calves or thighs.

  10. Fatigue in Legs: Heaviness with activity.

  11. Bowel/Bladder Changes: Incontinence or retention.

  12. Sexual Dysfunction: Loss of sensation or performance issues.

  13. Postural Relief: Symptoms ease when leaning forward.

  14. Postural Aggravation: Symptoms worse when standing straight.

  15. Nocturnal Pain: Nighttime leg or back pain.

  16. Sensory Loss: Reduced touch or temperature awareness.

  17. Referred Buttock Pain: Dull ache into buttocks.

  18. Saddle Anesthesia: Loss of sensation in perineal area.

  19. Muscle Spasm: Involuntary tightening of back muscles.

  20. Limping: Favoring one side to avoid pain. RadiopaediaVerywell Health

Diagnostic Tests

  1. Magnetic Resonance Imaging (MRI): Gold standard for soft-tissue detail.

  2. Computed Tomography (CT): Good for bone spurs and calcified discs.

  3. CT Myelogram: Contrast highlights CSF spaces and indentations.

  4. X-rays (Plain Films): Initial survey for bony alignment.

  5. Electromyography (EMG): Detects nerve conduction delays.

  6. Nerve Conduction Study: Measures signal speed in peripheral nerves.

  7. Discography: Provocative test injecting dye into disc.

  8. Bone Scan: Identifies infection, tumor, or fracture.

  9. Ultrasound: Limited use in dynamic assessment.

  10. Flexion-Extension X-rays: Shows instability.

  11. Somatosensory Evoked Potentials: Assess spinal cord pathways.

  12. Physical Exam: Straight Leg Raise Test: Identifies nerve root irritation.

  13. Neurological Exam: Reflexes, strength, sensation evaluation.

  14. Gait Analysis: Observing walking patterns.

  15. Laboratory Tests: Rule out infection or inflammatory causes.

  16. CT Angiography: If vascular abnormality suspected.

  17. Oblique X-rays: Assess facet orientation.

  18. Dynamic MRI: Imaging under flexion or extension.

  19. Positron Emission Tomography (PET): Rarely used for tumors.

  20. Intradural Pressure Monitoring: Experimental in research. PMCBMJ Best Practice

Non-Pharmacological Treatments

  1. Physical Therapy: Stretching and strengthening exercises.

  2. Core Strengthening: Improves spinal support.

  3. Flexibility Training: Hamstring and hip stretches.

  4. Yoga or Pilates: Gentle movements to improve posture.

  5. Aquatic Therapy: Buoyancy reduces spinal load.

  6. TENS (Electrical Nerve Stimulation): Pain modulation.

  7. Heat Therapy: Increases blood flow and relaxes muscles.

  8. Cold Packs: Reduces inflammation and numbs pain.

  9. Manual Therapy: Hands-on mobilization or manipulation.

  10. Massage Therapy: Relieves muscle tension.

  11. Traction: Spinal decompression via gentle pulling.

  12. Ergonomic Corrections: Proper desk and chair setup.

  13. Posture Training: Education on correct body alignment.

  14. Weight Management: Reduces spinal load.

  15. Walking Programs: Builds endurance and tolerance.

  16. Balance Exercises: Prevents falls and improves stability.

  17. Aquatic Walking: Low-impact cardio in water.

  18. Bracing: Temporary support to limit harmful motion.

  19. Mindfulness Meditation: Pain coping strategy.

  20. Biofeedback: Teaches relaxation and muscle control.

  21. Acupuncture: May offer short-term pain relief.

  22. Chiropractic Care: Spinal adjustments.

  23. Tai Chi: Slow, controlled movements for balance.

  24. Ergonomic Lifting Techniques: Prevent further injury.

  25. Pool Aerobics: Low-impact strengthening.

  26. Postural Orthotic Training: Retrains muscle patterns.

  27. Activity Modification: Avoiding aggravating activities.

  28. Functional Training: Improves daily living activities.

  29. Education and Lifestyle Coaching: Long-term behavior change.

  30. Aquatic Stretching: Enhanced flexibility in water. PhysiopediaPMC

Pharmacological Treatments (Drugs)

  1. Ibuprofen (NSAID): Reduces pain and swelling.

  2. Naproxen (NSAID): Longer-acting pain relief.

  3. Celecoxib (COX-2 inhibitor): Less gastric irritation.

  4. Acetaminophen: Mild to moderate pain control.

  5. Cyclobenzaprine: Muscle relaxant for spasms.

  6. Gabapentin: Nerve pain relief.

  7. Pregabalin: Neuropathic pain agent.

  8. Duloxetine: Antidepressant with pain-modulating effects.

  9. Tramadol: Weak opioid for moderate pain.

  10. Oxycodone: Strong opioid, short-term use only.

  11. Prednisone: Oral corticosteroid to reduce inflammation.

  12. Epidural Steroid Injection: Localized anti-inflammatory.

  13. Topical Lidocaine Patch: Numbs localized area.

  14. Capsaicin Cream: Depletes substance P from nerve endings.

  15. Baclofen: Spasticity and muscle relaxer.

  16. Diazepam: Short-acting muscle relaxant.

  17. Methocarbamol: Central muscle relaxant.

  18. Tizanidine: Alpha-2 agonist muscle relaxant.

  19. NSAID Gel (Diclofenac): Topical anti-inflammatory.

  20. Opioid Combination (Hydrocodone-APAP): Reserve for severe pain. MedscapeVerywell Health

Surgical Options

  1. Decompressive Laminectomy: Removing the back part of the vertebra to relieve pressure.

  2. Medial Facetectomy: Resection of part of the facet joint to widen the lateral recess.

  3. Laminotomy: Partial removal (“window”) in the lamina.

  4. Microdiscectomy: Minimally invasive removal of herniated disc fragment.

  5. Foraminotomy: Enlarging the intervertebral foramen.

  6. Endoscopic Decompression: Small-incision approach under camera guidance.

  7. Interspinous Process Spacer: Implant to keep space open between vertebrae.

  8. Spinal Fusion: Stabilizes vertebrae after decompression.

  9. Instrumented Posterolateral Fusion: With screws and rods for added support.

  10. Minimally Invasive Tubular Decompression: Muscle-sparing approach. Mayo ClinicMedscape

Prevention Strategies

  1. Maintain Healthy Weight: Lowers spinal load.

  2. Practice Safe Lifting: Bend at knees, not waist.

  3. Regular Exercise: Strengthens back and core.

  4. Ergonomic Workstation: Reduces spinal strain.

  5. Proper Posture: Both sitting and standing.

  6. Quit Smoking: Improves blood flow to discs.

  7. Balanced Nutrition: Supports bone and disc health.

  8. Adequate Hydration: Keeps discs pliable.

  9. Core Conditioning: Prevents instability.

  10. Frequent Movement Breaks: Avoids prolonged static positions. PMCVerywell Health

When to See a Doctor

Seek medical evaluation if you experience:

  • Severe or worsening leg weakness

  • Loss of bladder or bowel control

  • Rapidly progressive numbness in the groin (“saddle anesthesia”)

  • Intractable pain not relieved by rest or medication

  • Signs of infection (fever, chills) alongside back pain

  • Trauma with immediate onset of severe symptoms BMJ Best PracticeVerywell Health

Frequently Asked Questions

  1. What does lateral side thecal sac indentation mean?
    It describes a dent or flattening along the side of the thecal sac on imaging, usually caused by a nearby structure pressing inward. Radiopaedia

  2. What causes this indentation?
    Common culprits include herniated discs, enlarged facet joints, thickened ligaments, and bone spurs that encroach on the thecal sac. Radiopaedia

  3. How is it diagnosed?
    MRI is the best test to see soft-tissue details; CT myelogram can help if MRI is contraindicated. Clinical tests and history guide imaging choice. Spine

  4. Is it serious?
    Mild indentations may cause no symptoms, while severe indentations can press on nerves, leading to pain or weakness. Radiopaedia

  5. What symptoms should I watch for?
    Leg pain, numbness, muscle weakness, and difficulty walking are key red flags. Radiopaedia

  6. Can it go away on its own?
    Mild cases sometimes improve with activity modification and physical therapy, though structural causes may persist. Verywell Health

  7. What non-surgical treatments work best?
    A combination of targeted exercises, posture education, and modalities like TENS or aquatic therapy often yields relief. Physiopedia

  8. When is surgery necessary?
    If conservative care fails after several months or if neurological deficits (e.g., weakness, incontinence) develop, surgical decompression is considered. Mayo Clinic

  9. What are possible complications of untreated indentation?
    Chronic nerve compression can lead to permanent weakness, sensory loss, and, in rare cases, cauda equina syndrome. Radiopaedia

  10. Is exercise safe if I have this indentation?
    Yes—when guided by a trained therapist with exercises that avoid aggravating positions. PMC

  11. Can it cause permanent nerve damage?
    Prolonged, severe compression may damage nerves irreversibly; early treatment minimizes this risk. PMC

  12. How long does recovery take after surgery?
    Most patients see significant improvement within 6–12 weeks, though full recovery may take several months. Mayo Clinic

  13. Can poor posture lead to indentation?
    While posture alone rarely causes indentation, chronic bad posture can accelerate degenerative changes that contribute. BMJ Best Practice

  14. Can weight loss help?
    Yes—reducing body weight lessens stress on spinal structures, potentially slowing progression. Verywell Health

  15. Will I need pain medication?
    Many patients benefit from short-term NSAIDs or other analgesics while working on non-drug strategies. Medscape

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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  13. https://medlineplus.gov/ency/imagepages/19841.htm
  14. https://www.britannica.com/science/human-muscle-system
  15. https://training.seer.cancer.gov/anatomy/muscular/types.html
  16. https://www.britannica.com/science/human-muscle-system
  17. https://www.sciencedirect.com/topics/medicine-and-dentistry/skeletal-muscle
  18. https://academic.oup.com/nar/article/32/5/1792/2380623
  19. https://onlinelibrary.wiley.com/journal/10974598
  20. https://medlineplus.gov/skinconditions.html
  21. https://en.wikipedia.org/wiki/Category:Kidney_diseases
  22. https://kidney.org.au/your-kidneys/what-is-kidney-disease/types-of-kidney-disease
  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
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  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: Lateral Side 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.