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Start free with EleplanIsolated arrhinia
ORPHA:1134Malformation syndrome
Also called Isolated nose agenesis
What it is
An extremely rare, major congenital malformation consisting of an absence of the nose ranging from hyporrhinia (absence of external nasal structures) to total arrhinia (absence of external nose, nasal airways, olfactory bulbs, or olfactory nerve) often causing respiratory distress and requiring surgical correction. Arrhinia can be bilateral or unilateral (hemiarrhinia). Associated anomalies include ocular features (hypertelorism, microphthalmia, eyelid coloboma), facial clefts, midline defects and microtia.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Antenatal, Neonatal
- Inheritance
- Not applicable
- Classified as
- Malformation syndrome
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
Signs and symptoms
Common30–79%
11These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.
ICD-10 codes
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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