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ORPHA:137817

Arachnoiditis

low confidenceDisorder

Also known as: Adhesive arachnoiditis · Chronic arachnoiditis

Publications

5,815

Trials

4

Interventional, condition-specific

Researchers

989

Distinct authors in sample

Gene link

—

Readiness

3/6

Stages with a signal

Clinical definition (Orphanet)

A chronic inflammation of the arachnoid layer of the meninges, of which adhesive arachnoiditis is the most severe form, characterized by debilitating, intractable neurogenic back and limb pain and a range of other neurological problems.

How rare: How common this is has not been clearly measured.

Orphanet entry

Cross-references

Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.

Additional Mondo synonyms (4)

adhesive arachnoiditis · arachnoid mater inflammation · chronic arachnoiditis · inflammation of arachnoid mater

Research stages

Trial readiness signals

Where this condition sits on an open-data research pipeline — not how close a treatment is, and not medical advice. Empty stages often mean “not in these databases under this Mondo ID,” not “impossible.”

3/6 stages with a signal

An interventional trial matched this condition name on ClinicalTrials.gov — see trials below.

  1. Gene identifiedNot found

    No GenCC disease–gene assertion in this build

  2. LiteraturePresent

    5,815 matched papers (2,027 in last 10 years) Source

  3. Phenotype characterisedPresent

    18 HPO annotations (e.g. Abnormality of the skeletal system; Abnormality of metabolism/homeostasis; Spastic paraparesis) Source

  4. Animal modelNot found

    No Alliance genotype “model of” associations via Monarch for these Mondo IDs

  5. Orphan designationNot found

    No FDA or EMA orphan-drug designation matched this disease via UMLS or preferred name Source

  6. Interventional trialPresent

    4 matched on ClinicalTrials.gov (1 recruiting in sample)

Biology

Genes and phenotypes

Gene–disease validity from GenCC, plus phenotypes and animal models joined from Monarch Initiative via Mondo ID — not a clinical diagnosis aid.

Do we know what causes it?

Not yet — the cause hasn't been pinned down in GenCC.

No strong gene–disease assertion joined for this Orphanet entity.

Phenotypes (Monarch / HPO)

18

Associated phenotypes · MONDO:0015304

  • Abnormality of the skeletal system
  • Abnormality of metabolism/homeostasis
  • Spastic paraparesis
  • Hydrocephalus
  • Tinnitus

Showing 5 of 18 — open Monarch for the full list.

Animal models (Monarch / Alliance)

None returned for this Mondo ID. Empty here is not proof that no model organism work exists under another name or gene.

Monarch fetch 2026-07-29

Therapies

Designations, candidates, and chemicals

FDA OOPD and EMA orphan designations, Open Targets clinical candidates, and CTD chemical associations via MyDisease.info. These never change the interventional-trial headline.

Orphan designation (FDA · EMA)

No designation matched this disease via UMLS or preferred name on the FDA OOPD mirror or EMA orphan register. Absence here is not proof that none exists under another wording.

Open Targets candidates

No drugs or clinical candidates returned for this Mondo ID on Open Targets.

CTD chemicals (MyDisease.info)

13 associated chemicals. Therapeutic evidence is listed first when present — not a treatment recommendation.

  • Adrenal Cortex Hormones · therapeutic
  • Pentazocine · therapeutic
  • butamben · marker/mechanism
  • Cytarabine · marker/mechanism
  • Gentamicins · marker/mechanism
  • iocarmate meglumine · marker/mechanism
  • Melphalan · marker/mechanism
  • Methotrexate · marker/mechanism
  • Methylprednisolone Acetate · marker/mechanism
  • Paramethasone · marker/mechanism
  • Polyethylene Glycols · marker/mechanism
  • Prednisolone · marker/mechanism

MyDisease.info · MONDO:0015304

Literature

Is anyone studying this?

5,815

5,815 papers — among the better-studied rare conditions, though still a fraction of common-disease literature (breast cancer: over 700,000). Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=3967) is 59.

5,815 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 59 (publications denominator n=3967).

2,027 in the last 10 years · low confidence

Phrase hits: 5,815 · MeSH hits: 184

Open Europe PMC search

Who's working on it?

989

Distinct author names in 200 sampled papers — named people below.

Who's working on it?

People publishing on this condition (sampled Europe PMC records). Affiliation is the most recent found in that sample.

  1. 01
    Epstein NE7 papers · 2025

    Clinical Professor of Neurosurgery, School of Medicine, State University of NY at Stony Brook, and c/o Dr. Marc Agulnick, 1122 Franklin Avenue Suite 106, Garden City, NY, 11530, USA.

    Papers in Europe PMC
  2. 02
    Agulnick MA5 papers · 2025

    Assistant Clinical Professor of Orthopedics, NYU Langone Hospital, Long Island, NY, USA. 1122 Franklin Avenue Suite 106 Garden City, NY 11530., USA.

    Papers in Europe PMC
  3. 03
    Wang Y5 papers · 2025

    Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan Province, P.R. China. Electronic address: TCM_WYR@163.com.

    Papers in Europe PMC
  4. 04
    Wu H5 papers · 2026

    Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing , China.

    Papers in Europe PMC
  5. 05
    Liu S4 papers · 2026

    Macquarie Medical School, Faculty of Medicine, Health, and Human Sciences, Macquarie University, Sydney, NSW, Australia.

    Papers in Europe PMC
  6. 06
    Liu Z4 papers · 2025

    Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing , China.

    Papers in Europe PMC
  7. 07
    Wang K4 papers · 2025

    Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing , China.

    Papers in Europe PMC
  8. 08
    Zhang W4 papers · 2025

    Department of Rehabilitation Medicine, The Ganzhou Affiliated Hospital, Jiangxi Medical College, Nanchang University, Ganzhou, Jiangxi, China.

    Papers in Europe PMC
  9. 09
    Zhang X4 papers · 2025

    Department of endocrinology, Jinsha County People's Hospital Yangdeng Community, Xiluo Street, Jinsha County, Bijie City, Guizhou Province, 551801, China. zhangxy123z@163.com.

    Papers in Europe PMC
  10. 10
    He K3 papers · 2025

    Department of Neurosurgery, Peking University China-Japan Friendship School of Clinical Medicine, Beijing 100029, China; Department of Neurosurgery, China-Japan Friendship Hospital, Beijing 100029, China.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

4

interventional trials for this specific condition

4 interventional trials matched this specific condition name; 1 currently recruiting in our sample.

Data as of 11 September 2026

4 interventional trials — more than 77.2% of diseases in the trials denominator have none at all (5501 of 7126; this disease is at the 88.1th percentile).

low confidence · 88.1th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

4 interventional trials matched after quoted-phrase search and title/condition post-filter.

Observational and natural-history studies

1 observational study matches this condition. These do not test a treatment and are not counted in the interventional-trial headline, but they are genuine research: natural-history work often defines the endpoints needed for a future rare-disease trial, and families may be able to enroll.

None of the matched observational studies is currently listed as recruiting.

Open the complete matched search on ClinicalTrials.gov

Other registries (secondary)

Broader net from EU CTIS, ISRCTN, and ICTRP when available — deduped against ClinicalTrials.gov IDs already counted above. Dual-model LLM relevance gates what we keep. These rows are not added to the interventional headline.

raw 13 · after dedupe 13 · already on CT.gov 0 · kept 0 · parent 0 · uncertain 13 · dropped 0 · fetched 2026-07-30

Source notes: ictrp: Error: ICTRP public search unavailable (WHO portal is SPA-only; SOAP needs partnership). Tried: https://apps.who.int/tri

No secondary-registry studies passed dual-model relevance for this condition name (after dedupe).

Uncertain / not reviewed (13)

Where to find support

Condition-specific patient organisations, when Orphanet lists them, are on the disease’s Orphanet page. We also link umbrella groups that support undiagnosed and ultra-rare families.

Orphanet entry for Arachnoiditis — check Associations / patient organisations on that page.

India — NPRD

Last verified 2026-07-26

This ORPHAcode is not on our curated NPRD list (direct or Mondo-parent match). That does not decide clinical eligibility; families in India should ask a notified Centre of Excellence about current coverage.

Hand-curated for this project. ORPHAcode mappings are best-effort and may be incomplete or imprecise for umbrella categories. Parent (Mondo) matches mean the policy lists a broader category — confirm eligibility with a Centre of Excellence. Financial entitlements summarised from public policy statements and may change. This is not official government guidance.

How we counted this

Europe PMC query (preferred label + any corrected label + Orphanet and Mondo exact synonyms, stoplisted; unioned with resolved MeSH labels when available). UMLS / OMIM / NCIT cross-references are stored on the overview but are not added to the query string.

"Arachnoiditis" OR "Adhesive arachnoiditis" OR "Chronic arachnoiditis" OR "arachnoid mater inflammation" OR "inflammation of arachnoid mater" OR "inflammation of the arachnoid mater"

Run this search on Europe PMC

MeSH descriptor terms unioned into the query: Arachnoiditis

ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):

"Arachnoiditis" OR "Adhesive arachnoiditis" OR "Chronic arachnoiditis" OR "arachnoid mater inflammation" OR "inflammation of arachnoid mater" OR "inflammation of the arachnoid mater"

Interventional trials matched via: both (mesh = registered under a MeSH descriptor no name phrase would catch; recall-expansion = gene / selected parent terms used only for trials).

Study-type breakdown: 4 interventional · 1 observational · 0 expanded access. Only interventional studies enter the trial headline.

Query health: ok — strategies attempted: phrase, mesh; with hits: phrase, mesh

Run this search on ClinicalTrials.gov

Confidence reasoning

  • Preferred label is short or not clearly distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus
  • Publication count (5815) is extremely high with unknown/missing prevalence — treat as possible over-matching, not proven research intensity

Ingested 2026-07-27T07:29:36.222Z