ORPHA:1516
Non-syndromic bilambdoid and sagittal craniosynostosis
Also known as: BLSS · Bilateral lambdoid and sagittal synostosis · Isolated sagittal and bilambdoid craniosynostosis · Non-syndromic sagittal and bilateral lambdoid synostosis
Publications
16
29.7th percentile
Trials
0
Interventional, condition-specific
Researchers
77
Distinct authors in sample
Gene link
—
Readiness
1/6
Stages with a signal
Clinical definition (Orphanet)
A rare cranial syndrome characterized by the premature closure of both lambdoid sutures and the posterior sagittal suture, resulting in abnormal skull contour (frontal bossing, anterior turricephaly with mild brachycephaly, biparietal narrowing, occipital concavity) and facial features (low-set ears, midfacial hypoplasia). Short stature, , , and oculomotor dyspraxia have also been reported. Associated anomalies include enlargement of the cerebral ventricles, agenesis of the corpus callosum, Arnold-Chiari type I, venous anomalies of skull, and hydrocephalus.
How rare: <1 / 1 000 000 — fewer than one in a million. In a city the size of Kolkata, that might mean on the order of fifteen people.
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.”
1/6 stages with a signal
Research-stage checklist from open sources (GenCC, literature, Monarch when enriched, ClinicalTrials.gov). Not a prognosis or care recommendation.
- Gene identifiedNot found
No GenCC disease–gene assertion in this build
- LiteraturePresent
16 matched papers (12 in last 10 years) Source
- Phenotype characterisedNot checked
Not yet enriched from Monarch / HPO
- Animal modelNot checked
Not yet enriched from Monarch / Alliance
- Orphan designationNot checked
FDA/EMA orphan-drug designation not enriched yet
- Interventional trialNot found
No matched interventional trial under our ClinicalTrials.gov rules
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)
Not enriched in this build — Monarch phenotype joins were not run for this record.
Animal models (Monarch / Alliance)
Not enriched in this build.
Literature
Is anyone studying this?
16
16 papers have ever been indexed under this name. For scale, breast cancer has over 700,000. Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=5449) is 41.
16 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 41 (publications denominator n=5449).
12 in the last 10 years · medium confidence · 29.7th percentile (publications denominator)
Phrase hits: 16 · MeSH hits: 0
Who's working on it?
77
Distinct author names in 16 sampled papers — named people below.
Who's working on it?
No interventional trial matched this name; these authors publish on it in the sampled literature — a practical starting point for contact.
- 01Harada A2 papers · 2024
Department of Pediatric Neurosurgery, Takatsuki General Hospital, Takatsuki, Osaka, Japan.
Papers in Europe PMC - 02Kyutoku S2 papers · 2024
Division of Reconstructive Plastic Surgery, Nara City Hospital, Nara, Nara, Japan.
Papers in Europe PMC - 03Maeno K2 papers · 2024
Department of Neurosurgery, Takatsuki General Hospital, Takatsuki, Osaka, Japan.
Papers in Europe PMC - 04Nakamura N2 papers · 2024
Department of Pediatric Neurosurgery, Takatsuki General Hospital, Takatsuki, Osaka, Japan.
Papers in Europe PMC - 05Taheri Z2 papers · 2021
Rehabilitation Research Center, Department of Orthotics and Prosthetics, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.
Papers in Europe PMC - 06Ueda K2 papers · 2024
Department of Plastic and Reconstructive Surgery, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka, Japan.
Papers in Europe PMC - 07Ackerman LL1 paper · 2015
Department of Neurosurgery, Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, Indiana; and.
Papers in Europe PMC - 08Anstadt EE1 paper · 2021
Department of Plastic Surgery, University of Pittsburgh School of Medicine.
Papers in Europe PMC - 09Aquino V1 paper · 2026
Division of Cleft & Craniofacial Surgery, El Paso Children's Hospital, El Paso, Texas.
Papers in Europe PMC - 10Arnaud E1 paper · 2018
Craniofacial Unit, Department of Pediatric Neurosurgery, Hôpital Necker-Enfants Malades, Paris, France.
Papers in Europe PMC
Clinical research
Is a treatment being tested?
0
interventional trials for this specific condition
No interventional trial testing a treatment matched this specific condition name on ClinicalTrials.gov (observational studies and pan-disease registries are listed separately when present).
Data as of 27 July 2026
No matched interventional trials. This is true for 73% of diseases in the trials denominator (5114 of 7003). Here are the researchers publishing on it.
medium confidence · 36.5th percentile (trials denominator)
Recruiting interventional trials
From the matched ClinicalTrials.gov set
No interventional trial testing a treatment was found for this specific condition name on ClinicalTrials.gov.
See who's working on it — people publishing on this disease are often the practical next contact when no trial is listed.
Where to find support
We do not yet link condition-specific patient organisations. These umbrella groups support undiagnosed and ultra-rare families:
India — NPRD
Last verified 2026-07-26This 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.
"Non-syndromic bilambdoid and sagittal craniosynostosis" OR "Bilateral lambdoid and sagittal synostosis" OR "Isolated sagittal and bilambdoid craniosynostosis" OR "Non-syndromic sagittal and bilateral lambdoid synostosis"
ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):
"Non-syndromic bilambdoid and sagittal craniosynostosis" OR "Bilateral lambdoid and sagittal synostosis" OR "Isolated sagittal and bilambdoid craniosynostosis" OR "Non-syndromic sagittal and bilateral lambdoid synostosis"
Study-type breakdown: 0 interventional · 0 observational · 0 expanded access. Only interventional studies enter the trial headline.
Query health: ok — strategies attempted: phrase; with hits: phrase
Run this search on ClinicalTrials.gov
Synonyms dropped by stoplist: BLSS
Confidence reasoning
- Preferred label is multi-word and distinctive
- 1 synonym(s) dropped by stoplist (may under-count)
- No label/synonym collisions with other diseases in this corpus
Ingested 2026-07-26T17:36:52.121Z