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Proboscis lateralis (PL) is a rare congenital facial abnormality characterized by failed development of the external nose on one side that is replaced by a tubular structure composed of skin and soft tissue usually attached at the inner canthus of the eye and therefore often associated with maldevelopment of the nasal cavity or paranasal sinuses of the affected side. PL is also associated with other craniofacial abnormalities such as orbital anomalies, cleft lip/palate, frontal encephalocele and holoprosencephaly.
Features include very common findings: Abnormal paranasal sinus morphology and Proboscis; and common findings: Eyelid coloboma, Morphological central nervous system abnormality, Enlarged brain ventricles (ventriculomegaly), and Single naris and others. 49 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Eyes | 7 | Abnormality of the ocular adnexa, Optic nerve hypoplasia, Cloudy or opaque cornea (corneal opacity) |
Phenotype severity distribution: 2 very common features, 8 common features.
Estimated prevalence: Unknown (Unknown prevalence).
No clinical trials have been registered for proboscis lateralis.
7 publications have been identified in PubMed for proboscis lateralis. Research spans Case Report / Case Series (86%) and Review / Meta-Analysis (14%).
Aryal S (2026). [PMID: 41727820](https://pubmed.ncbi.nlm.nih.gov/41727820/). *Radiol Case Rep*. [Case Report / Case Series]
Yang X (2025). [PMID: 37204775](https://pubmed.ncbi.nlm.nih.gov/37204775/). *Ear Nose Throat J*. [Case Report / Case Series]
Hakimi T (2025). [PMID: 41272582](https://pubmed.ncbi.nlm.nih.gov/41272582/). *BMC Pediatr*. [Review / Meta-Analysis]
Casillas-Ituarte AA (2024). [PMID: 39752268](https://pubmed.ncbi.nlm.nih.gov/39752268/). *Rev Alerg Mex*. [Case Report / Case Series]
Elger T (2024). [PMID: 38864892](https://pubmed.ncbi.nlm.nih.gov/38864892/). *Arch Gynecol Obstet*. [Case Report / Case Series]
Wang P (2024). [PMID: 38840680](https://pubmed.ncbi.nlm.nih.gov/38840680/). *Transl Pediatr*. [Case Report / Case Series]
Data assembled from 4 of 12 sources · Last updated Sep 19, 2026, 1:53 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center
Head and neck | 6 | Abnormal facial skeleton morphology, Abnormality of the maxillary sinus, Orofacial cleft |
Kidneys and urinary system | 2 | Unilateral renal agenesis, Duplication of renal pelvis |
Nervous system (morphological) | 1 | Morphological central nervous system abnormality |
Brain and nerves | 1 | Enlarged brain ventricles (ventriculomegaly) |
Bones and joints | 1 | Abnormal ethmoid bone morphology |
Heart and blood vessels | 1 | Ventricular septal defect |
Sinha P (2024). [PMID: 39240207](https://pubmed.ncbi.nlm.nih.gov/39240207/). *Ophthalmic Plast Reconstr Surg*. [Case Report / Case Series]