ORPHA:728725
Fetus in fetu
Also known as: Foetus in foetu · Fetus-in-fetu · FIF · Cryptodidymus
Publications
453
Trials
0
Interventional, condition-specific
Researchers
948
Distinct authors in sample
Gene link
—
Readiness
1/6
Stages with a signal
How rare: 1-9 / 1 000 000 — roughly one to nine people per million. In a city the size of Kolkata, perhaps a few dozen.
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
453 matched papers (148 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?
453
453 papers have ever been published on this condition (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.
453 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).
148 in the last 10 years · low confidence
Phrase hits: 453 · MeSH hits: 0
Who's working on it?
948
Distinct author names in 200 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.
- 01Chen S3 papers · 2023
Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College Huazhong University of Science and Technology Wuhan China.
Papers in Europe PMC - 02Ji Y3 papers · 2022
Division of Oncology, Department of Pediatric Surgery, West China Hospital of Sichuan University, 37# Guo-Xue-Xiang, Chengdu 610041, China. jijiyuanyuan@163.com.
Papers in Europe PMC - 03Menon P3 papers · 2022
Department of Pediatric Surgery, PGIMER, Chandigarh, India.
Papers in Europe PMC - 04Agrawal V2 papers · 2026
Department of Surgery, University College of Medical Sciences & Guru Teg Bahadur Hospital, New Delhi. vivekgtbh@gmail.com
Papers in Europe PMC - 05Asmati M2 papers · 2026
Pediatric Surgery Department, French Medical Institute for Mothers and Children (FMIC), Kabul, Afghanistan.
Papers in Europe PMC - 06Chen J2 papers · 2022
Department of Radiology, Tianjin Children's Hospital, Tianjin, 300134, China.
Papers in Europe PMC - 07Chen X2 papers · 2026
Department of Anesthesiology, Peking University International Hospital, Beijing, China (mainland).
Papers in Europe PMC - 08Cingel V2 papers · 2012
Department of Pediatric Surgery, Faculty of Medicine and Children's Medical Hospital, Comenius University in Bratislava, Limbova Street 1, 833 40, Bratislava, Slovakia.
Papers in Europe PMC - 09Di Meglio L2 papers · 2019
a Diagnostica Ecografica e Prenatale "Aniello Di Meglio" , Napoli , Italia.
Papers in Europe PMC - 10Gabbeta S2 papers · 2025
Department of Obstetrics and Gynaecology, All India Institute of Medical Sciences, Hyderabad, Telangana, India.
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.
low 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.
"Fetus in fetu" OR "Foetus in foetu" OR "Fetus-in-fetu" OR "Cryptodidymus"
ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):
"Fetus in fetu" OR "Foetus in foetu" OR "Fetus-in-fetu" OR "Cryptodidymus"
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: FIF
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
- No Orphanet definition and no Mondo IDs — likely taxonomy scaffolding; confidence capped at low
Ingested 2026-07-27T21:30:17.318Z