Single naris

What it means

The presence of only a single nostril.

The single opening may occur in the midline or it can occur on one side, that is, it can be symmetric or asymmetric. Although the columella is invariably absent, this is implicit and does not need to be separately specified.

Rare diseases that can present with this6

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: One nostril · Single nare · Single nostril