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Rhizomelic syndrome, Urbach type is a rare primary bone dysplasia characterized by upper limbs rhizomelia and other skeletal anomalies (e.g. short stature, dislocated hips, digitalization of the thumb with bifid distal phalanx), craniofacial features (e.g. microcephaly, large anterior fontanelle, fine and sparse scalp hair, depressed nasal bridge, high arched palate, micrognathia, short neck), congenital heart defects (e.g. pulmonary stenosis), delayed psychomotor development and mild flexion contractures of elbows. Radiologic evaluation may reveal flared epiphyses, platyspondyly and/or digital anomalies.
Features include: Microcephaly, Rhizomelia, Short stature, and Wide anterior fontanel and 5 more.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Head and neck | 1 | Microcephaly |
Growth and development |
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
Data assembled from 4 of 12 sources · Last updated Sep 19, 2026, 9:40 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Short stature |