Nail–patella syndrome

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Nail–patella syndrome is a rare genetic disorder that results in small, poorly developed or deformed nails (especially of thumbs) and — next in order/frequency — hypoplastic kneecaps.

Excerpt from the Wikipedia article “Nail–patella syndrome”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jan Wijten at Dutch Wikipedia, CC BY-SA 3.0, via Wikimedia Commons.