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Hall-Riggs syndrome is a very rare syndrome consisting of microcephaly with facial dysmorphism, spondylometaepiphyseal dysplasia and severe intellectual deficit.
Features include: Epicanthus, Anteverted nares, Brachydactyly, and Seizure and 21 more.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Bones and joints | 5 | Weak and brittle bones (osteoporosis), Irregular vertebral endplates, Sideways curvature of the spine (scoliosis) |
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Hall-Riggs syndrome.
2 publications have been identified in PubMed for Hall-Riggs syndrome. Research spans Review / Meta-Analysis (50%) and Clinical Trial Publication (50%).
Wendt M (2025). [PMID: 41270086](https://pubmed.ncbi.nlm.nih.gov/41270086/). *PloS one*. [Clinical Trial Publication]
Thompson E (2025). [PMID: 40131582](https://pubmed.ncbi.nlm.nih.gov/40131582/). *Current osteoporosis reports*. [Review / Meta-Analysis]
Data assembled from 5 of 12 sources · Last updated Sep 20, 2026, 11:12 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Hall-Riggs syndrome
4 |
Seizure, Intellectual disability, Absent speech |
Head and neck | 3 | U-Shaped upper lip vermilion, Thick lower lip vermilion, Microcephaly |
Growth and development | 2 | Failure to thrive, Intrauterine growth retardation |
Digestive system | 1 | Feeding difficulties in infancy |