What are thumb hypoplasia and aplasia?

Also known as: hypoplastic thumb, missing thumb.

Thumb hypoplasia and aplasia are birth differences that affect the thumb. Thumb hypoplasia means that the thumb is typically underdeveloped and small. With thumb aplasia, the thumb is missing altogether.

Reviewed by: Aaron J Berger, MD

This page was last updated on: 1/29/2019 3:21:13 PM

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