Split nail

What it means

A nail plate that has a longitudinal separation and the two sections of the nail share the same lateral radius of curvature.

This is distinct from Fused nail, where the two parts of the nail have a separate radius of curvature. The affected digits should be specified as described in the introductory comments.

Rare diseases that can present with this2

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