Proboscis lateralis

Proboscis lateralis is an extremely rare congenital malformation of the nose in which a tubular, trunk-like appendage (proboscis) arises from the side of the face, typically near the inner corner of the eye or the lateral aspect of the nose. This structure replaces or is associated with an absent or underdeveloped nasal cavity on the affected side. The condition is present at birth and is classified among developmental anomalies of the nose and nasal structures. The proboscis is typically a blind-ending, tubular soft tissue structure lined with respiratory-type epithelium, and it may contain rudimentary cartilage or bone. In most cases, the condition is unilateral. Proboscis lateralis may occur as an isolated anomaly or in association with other craniofacial malformations, including ipsilateral nasal agenesis or hypoplasia, choanal atresia, lacrimal duct abnormalities, and occasionally orbital or midface defects. Some cases have been reported alongside more complex conditions such as holoprosencephaly spectrum anomalies, though isolated forms are more common. The contralateral nasal passage is usually normal, allowing adequate breathing in most affected newborns. Treatment is primarily surgical and involves excision of the proboscis with reconstruction of the nasal framework and external nose. Surgical correction is typically staged and may require multiple procedures over childhood to achieve optimal cosmetic and functional outcomes, including rhinoplasty techniques and tissue expansion. Multidisciplinary care involving craniofacial surgeons, otolaryngologists, and ophthalmologists is often necessary. Long-term prognosis for isolated proboscis lateralis is generally favorable with appropriate surgical management.

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