Splenius Capitis Cysts

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Article Summary

A splenius capitis cyst is a rare, fluid‑filled sac that forms in or near the splenius capitis muscle in the back of your neck. Though uncommon, these cysts can cause pain, stiffness, and lumps in the neck. A splenius capitis cyst is a benign (non‑cancerous) sac filled with fluid or semi‑solid material, located within or just beside the splenius capitis muscle. These cysts may grow...

Key Takeaways

  • This article explains Anatomy of the Splenius Capitis Muscle in simple medical language.
  • This article explains Types of Splenius Capitis Cysts in simple medical language.
  • This article explains Causes in simple medical language.
  • This article explains Symptoms in simple medical language.
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Start here Choose the right pathway for symptoms, reports, medicines, or urgent warning signs. Disease article roadmap Read this topic step by step: meaning, symptoms, warning signs, diagnosis, treatment, prevention, and follow-up. Treatment planner Prepare questions about treatment choices, benefits, risks, side effects, and follow-up. Family & caregiver guide Organize symptoms, reports, medicines, questions, and follow-up safely. Nutrition & diet guide Prepare food, hydration, supplement, and medicine-timing questions safely. Prevention guide Organize risk factors, protective habits, screening, and warning signs. Recovery guide Prepare a safe plan for activity, rehabilitation, warning signs, and follow-up.
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Emergency safety firstUrgent warning signs are highlighted below.
Definition

A splenius capitis cyst is a rare, fluid‑filled sac that forms in or near the splenius capitis muscle in the back of your neck. Though uncommon, these cysts can cause , , and lumps in the neck.

A splenius capitis cyst is a (non‑cancerous) sac filled with fluid or semi‑solid material, located within or just beside the splenius capitis muscle. These cysts may grow slowly and can cause local symptoms by pressing on nearby tissues.


of the Splenius Capitis Muscle

Understanding where a cyst appears starts with knowing the muscle’s anatomy.

Structure & Location

  • Shape & Size: Broad, strap‑shaped muscle on each side of the back of the neck.

  • Layer: Lies just under the skin and trapezius muscle, above deeper neck muscles.

Origin

  • Lower half of the nuchal (neck) .

  • Spinous processes of C7 to T3 (sometimes T4) .

Insertion

  • Mastoid process of the temporal bone (behind the ear).

  • Lateral third of the superior nuchal line of the occipital bone (back of the ).

Blood Supply

  • Occipital (branch of the external carotid artery).

  • Deep artery (branch of the costocervical trunk).

Nerve Supply

  • Dorsal rami of the middle cervical spinal nerves (C3 and C4).

Primary Functions

  1. Head Extension: Tilts head backward.

  2. Head Rotation: Turns head to the same side.

  3. Lateral Flexion: Bends neck sideways toward the same side.

  4. Neck Stability: Helps maintain upright head posture.

  5. Assisting Respiration: Aids chest expansion when breathing hard.

  6. Fine Head Control: Works with other muscles for smooth head movements.


Types of Splenius Capitis Cysts

Cysts in this muscle can be categorized by their origin or content:

  1. Synovial Cyst: Fluid leaks from nearby vertebral joints.

  2. Cyst: Jelly‑like fluid without a true lining.

  3. Epidermoid Cyst: Skin cells trapped under the surface.

  4. Dermoid Cyst: Developmental cyst containing skin structures.

  5. Branchial Cleft Cyst: pouch near neck muscles.

  6. Lymphatic (Lymphangioma) Cyst: Dilated lymph vessels.

  7. Parasitic Cyst: Caused by parasites (e.g., hydatid disease).

  8. (Infectious) Cyst: ‑filled pocket from .

  9. Retention (Mucoid) Cyst: Blocked gland fluid.

  10. Neoplastic Cyst: Cystic form of a benign (e.g., cystic schwannoma).


Causes

  1. Facet Joint Wear & Tear ()

  2. or Injury (whiplash, blow to neck)

  3. Repetitive (poor posture, desk work)

  4. Congenital Defects (branchial cleft anomalies)

  5. Skin Cell Blockage (epidermoid cyst formation)

  6. Infections ( abscess)

  7. Parasitic Infections (echinococcus/hydatid)

  8. Blocked Lymph Channels (lymphangioma)

  9. Gland Duct Obstruction (retention cyst)

  10. Tumor Degeneration (cystic change in benign tumors)

  11. Inflammatory Diseases ()

  12. Conditions (, Sjögren’s)

  13. Metabolic Disorders (‑related poor healing)

  14. Post‑surgical Changes (scar tissue trapping fluid)

  15. (tissue damage leads to cyst)

  16. Chemical Irritation (injected medications)

  17. Poor Nutrition (weak tissue structure)

  18. Age‑Related Changes (degeneration of joints)

  19. High‑impact Sports (micro‑tears and fluid build‑up)

  20. Smoking (impaired healing, )


Symptoms

  1. Neck Lump (palpable bump)

  2. Local Pain (dull or sharp)

  3. Stiffness (reduced neck motion)

  4. Headaches (base of skull)

  5. Muscle (tightness around cyst)

  6. Radiating Pain (to shoulder or arm)

  7. or (nerve compression)

  8. Weakness (in neck or arm)

  9. Redness (overlying skin)

  10. Warmth (indicates inflammation)

  11. Swelling (increased size over days/weeks)

  12. Fever (if infected)

  13. Night Pain (wakes you up)

  14. Difficulty Swallowing (rare, large cysts)

  15. Difficulty Turning Head (pain‑limited motion)

  16. Visible Asymmetry (one side looks different)

  17. Tension in Shoulders (referred)

  18. Grinding Sensation (joint‑based cyst)

  19. Fatigue (chronic discomfort)

  20. Skin Dimpling or Pitting (adhesions)


Diagnostic Tests

  1. Physical Exam (palpation, motion tests)

  2. Ultrasound (fluid vs. solid)

  3. X‑ray (bone changes, joint arthritis)

  4. CT Scan (detailed bone and soft tissue view)

  5. MRI (best for soft tissue and cyst detail)

  6. CT Myelography (if nerve root involvement)

  7. PET Scan (rule out malignancy)

  8. Fine‑Needle Aspiration (fluid sampling)

  9. Core Needle Biopsy (tissue sample)

  10. Fluid Analysis (cell count, crystals, culture)

  11. Blood Tests (CBC, ESR, CRP for inflammation)

  12. Serology (parasite or autoimmune markers)

  13. EMG/Nerve Conduction (nerve compression)

  14. Ultrasound Elastography (fluid stiffness)

  15. Fluoroscopy (dynamic joint imaging)

  16. Bone Scan (rule out bone disease)

  17. Histopathology (under microscope)

  18. Immunohistochemistry (tumor markers)

  19. Culture & Sensitivity (infection)

  20. Genetic Testing (rare congenital cases)


Non‑Pharmacological Treatments

  1. Rest & Activity Modification

  2. Heat Therapy (warm packs)

  3. Cold Therapy (ice packs)

  4. Ultrasound Therapy (deep heating)

  5. Shockwave Therapy

  6. TENS (Transcutaneous Electrical Nerve Stimulation)

  7. Massage Therapy

  8. Myofascial Release

  9. Dry Needling

  10. Acupuncture

  11. Stretching Exercises

  12. Strengthening Exercises

  13. Posture Correction

  14. Ergonomic Workstation Setup

  15. Cervical Traction

  16. Cervical Collar (short‑term)

  17. Yoga (neck‑friendly poses)

  18. Pilates (core stability)

  19. Chiropractic Adjustment

  20. Osteopathic Manipulation

  21. Hydrotherapy (water exercises)

  22. Kinesio Taping

  23. Foam Rolling

  24. Breathing Exercises (relaxation)

  25. Stress Management (mindfulness)

  26. Weight Management (reduce strain)

  27. Ergonomic Pillow (neck support)

  28. Ergonomic Chair (lumbar support)

  29. Work/Rest Cycling (micro‑breaks)

  30. Education & Self‑Care (neck safety)


Drugs

  1. Ibuprofen (NSAID)

  2. Naproxen (NSAID)

  3. Diclofenac (NSAID)

  4. Acetaminophen (paracetamol)

  5. Celecoxib (COX‑2 inhibitor)

  6. Meloxicam (NSAID)

  7. Tramadol (weak opioid)

  8. Codeine (opioid)

  9. Cyclobenzaprine (muscle relaxant)

  10. Baclofen (muscle relaxant)

  11. Prednisone (oral steroid)

  12. Methylprednisolone (injection)

  13. Lidocaine (local anesthetic injection)

  14. Gabapentin (neuropathic pain)

  15. Pregabalin (neuropathic pain)

  16. Albendazole (anti‑parasitic)

  17. Praziquantel (anti‑parasitic)

  18. Penicillin (antibiotic)

  19. Cefazolin (antibiotic)

  20. Methotrexate (for rheumatoid arthritis)


Surgical Treatments

  1. Open Excision (complete removal)

  2. Minimally Invasive Endoscopic Excision

  3. Ultrasound‑Guided Aspiration (fluid drainage)

  4. Arthroscopic Facet Joint Cyst Removal

  5. Cervical Laminectomy & Decompression

  6. Microsurgical Cyst Resection

  7. Aspiration + Sclerotherapy (inject sclerosant)

  8. Excisional Biopsy (diagnostic + therapy)

  9. Fascia Release (reduce tissue tension)

  10. Reconstructive Closure (cosmetic repair)


Prevention Strategies

  1. Maintain Good Posture (neutral spine)

  2. Ergonomic Work Setup

  3. Regular Neck‑Strengthening Exercises

  4. Avoid Repetitive Neck Strain

  5. Use Proper Pillow Support

  6. Warm‑Up Before Sports

  7. Early Arthritis Management

  8. Limit High‑Impact Activities

  9. Quit Smoking (improves healing)

  10. Balanced Diet & Hydration


When to See a Doctor

  • Rapid Growth of neck lump

  • Severe or Worsening Pain that limits daily life

  • Neurological Signs (numbness, weakness)

  • Fever or Infection Signs (redness, warmth)

  • Difficulty Swallowing or Breathing

  • No Improvement after 2–4 weeks of self‑care

  • Night Pain that wakes you up

  • Skin Changes (ulceration, dimpling)

  • History of Cancer (rule out malignancy)


Frequently Asked Questions

  1. What is a splenius capitis cyst?
    A fluid‑filled sac in or near the splenius capitis muscle at the back of your neck.

  2. Are splenius capitis cysts common?
    No. They are rare compared to other neck cysts.

  3. What causes these cysts?
    Causes range from arthritis and injury to congenital defects and infections.

  4. Can a splenius capitis cyst go away on its own?
    Small cysts sometimes shrink, but many need treatment if they cause symptoms.

  5. How are these cysts diagnosed?
    Physical exam plus imaging like ultrasound or MRI. Sometimes fluid sampling.

  6. What treatments are available?
    Options include physical therapy, medications, and—if needed—aspiration or surgery.

  7. Is surgery always needed?
    No. Many cysts can be managed non‑surgically unless they cause severe symptoms or grow.

  8. What are the risks of surgery?
    Infection, nerve injury, scarring, or cyst recurrence are possible.

  9. Can cysts recur after removal?
    Yes—especially if the underlying cause (e.g., joint arthritis) isn’t treated.

  10. Are there home remedies?
    Yes: rest, heat/cold packs, gentle exercises, and posture correction can help.

  11. Can I work out with a splenius capitis cyst?
    Light exercise is okay, but avoid heavy or repetitive neck strain until you see a doctor.

  12. Will I feel pain during aspiration?
    A local anesthetic is used, so you should feel minimal discomfort.

  13. Can these cysts turn cancerous?
    Almost never. They are almost always benign.

  14. How long is recovery after surgery?
    Most people return to normal in 2–6 weeks, depending on the procedure.

  15. Who treats splenius capitis cysts?
    Usually an orthopedic surgeon, neurosurgeon, or ENT specialist.

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 Update: April 16, 2025.

  1. https://pubmed.ncbi.nlm.nih.gov/27887750/
  2. https://www.ncbi.nlm.nih.gov/books/NBK537139/
  3. https://www.ncbi.nlm.nih.gov/books/NBK537236/
  4. https://www.ncbi.nlm.nih.gov/books/NBK537140/
  5. https://pubmed.ncbi.nlm.nih.gov/30335291/
  6. https://pubmed.ncbi.nlm.nih.gov/30725921/
  7. https://pubmed.ncbi.nlm.nih.gov/30725824/
  8. https://www.ncbi.nlm.nih.gov/books/NBK559006/
  9. https://pubmed.ncbi.nlm.nih.gov/30725825/
  10. https://en.wikipedia.org/wiki/Muscle
  11. https://en.wikipedia.org/wiki/List_of_skeletal_muscles_of_the_human_body
  12. https://medlineplus.gov/ency/imagepages/19841.htm
  13. https://www.britannica.com/science/human-muscle-system
  14. https://training.seer.cancer.gov/anatomy/muscular/types.html
  15. https://www.britannica.com/science/human-muscle-system
  16. https://www.sciencedirect.com/topics/medicine-and-dentistry/skeletal-muscle
  17. https://academic.oup.com/nar/article/32/5/1792/2380623
  18. https://onlinelibrary.wiley.com/journal/10974598
  19. https://medlineplus.gov/skinconditions.html
  20. https://en.wikipedia.org/wiki/Category:Kidney_diseases
  21. https://kidney.org.au/your-kidneys/what-is-kidney-disease/types-of-kidney-disease
  22. https://www.niddk.nih.gov/health-information/kidney-disease
  23. https://www.kidney.org/kidney-topics/chronic-kidney-disease-ckd
  24. https://www.kidneyfund.org/all-about-kidneys/types-kidney-diseases
  25. https://www.aad.org/about/burden-of-skin-disease
  26. https://www.usa.gov/federal-agencies/national-institute-of-arthritis-musculoskeletal-and-skin-diseases
  27. https://www.cdc.gov/niosh/topics/skin/default.html
  28. https://www.mayoclinic.org/diseases-conditions/brain-tumor/symptoms-causes/syc-20350084
  29. https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Understanding-Sleep
  30. https://www.cdc.gov/traumaticbraininjury/index.html
  31. https://www.skincancer.org/
  32. https://illnesshacker.com/
  33. https://endinglines.com/
  34. https://www.jaad.org/
  35. https://www.psoriasis.org/about-psoriasis/
  36. https://books.google.com/books?
  37. https://www.niams.nih.gov/health-topics/skin-diseases
  38. https://cms.centerwatch.com/directories/1067-fda-approved-drugs/topic/292-skin-infections-disorders
  39. https://www.fda.gov/files/drugs/published/Acute-Bacterial-Skin-and-Skin-Structure-Infections—Developing-Drugs-for-Treatment.pdf
  40. https://dermnetnz.org/topics
  41. https://www.aaaai.org/conditions-treatments/allergies/skin-allergy
  42. https://www.sciencedirect.com/topics/medicine-and-dentistry/occupational-skin-disease
  43. https://aafa.org/allergies/allergy-symptoms/skin-allergies/
  44. https://www.nibib.nih.gov/
  45. https://www.nei.nih.gov/
  46. https://en.wikipedia.org/wiki/List_of_skin_conditions
  47. https://en.wikipedia.org/?title=List_of_skin_diseases&redirect=no
  48. https://en.wikipedia.org/wiki/Skin_condition
  49. https://oxfordtreatment.com/
  50. https://www.nidcd.nih.gov/health/
  51. https://consumer.ftc.gov/articles/w
  52. https://www.nccih.nih.gov/health
  53. https://catalog.ninds.nih.gov/
  54. https://www.aarda.org/diseaselist/
  55. https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets
  56. https://www.nibib.nih.gov/
  57. https://www.nia.nih.gov/health/topics
  58. https://www.nichd.nih.gov/
  59. https://www.nimh.nih.gov/health/topics
  60. https://www.nichd.nih.gov/
  61. https://www.niehs.nih.gov
  62. https://www.nimhd.nih.gov/
  63. https://www.nhlbi.nih.gov/health-topics
  64. https://obssr.od.nih.gov/
  65. https://www.nichd.nih.gov/health/topics
  66. https://rarediseases.info.nih.gov/diseases
  67. https://beta.rarediseases.info.nih.gov/diseases
  68. https://orwh.od.nih.gov/

 

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?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

  • Write when the problem started and how it changed.
  • Bring old prescriptions, investigation reports, and current medicines.
  • Write allergies, pregnancy status, diabetes, kidney/liver disease, and major past illnesses.
  • Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

  • What is the most likely cause of my symptoms?
  • Which danger signs mean I should go to hospital quickly?
  • Which tests are necessary now, and which can wait?
  • How should I take medicines safely and what side effects should I watch for?
  • When should I come for follow-up?

Tests to discuss

  • Vital signs: temperature, pulse, blood pressure, oxygen saturation
  • Basic physical examination by a clinician
  • CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

  • Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
  • Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
  • Do not delay emergency care when danger signs are present.

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: Splenius Capitis Cysts

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.