Thumb hypoplasia is a type of congenital hand abnormality and may be seen in isolation or with other congenital abnormalities (including other hand abnormalities, radial ray deficiency or other syndromes, e.g. Holt-Oram and Fanconi syndrome).
Classification
There are several types of thumb abnormalities that range from a slightly small hypoplastic thumb, all the way to complete absence and thumb aplasia 1.
type 1: smaller thumb
type 2: abnormal muscles
type 3a: absent muscles
type 3b: abnormal bones
type 4: absent bones
type 5: absent thumb
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