Polydactyly

Case contributed by Dr Sinéad Culleton

Presentation

Accessory digits on examination.

Patient Data

Age: 2 years
Gender: Male
X-ray

There is an accessory post-axial digit on the right and left hands, on the ulnar aspect of the little finger but separate from the bones of the little finger.

X-ray

There is an accessory post-axial digit, adjacent to but separate to the fifth digit on the right and left foot.

Case Discussion

Polydactyly refers to the presence of extra digits which can be fully formed digits or poorly formed and it is the commonest hand anomaly 1. It may be classified according to the location of the extra digit. Pre-axial or radial is when the extra digit affects the thumb. Post-axial or ulnar affects the little finger and very rarely central which affects the three central digits1,2

Polydactyly can occur alone (as in this case)  or may occur along with syndactyly. Post-axial is the commonest type and is usually an isolated finding in the absence of any associated syndrome. It can be associated with a number of syndromes however including; trisomy 13, Bardet-Biedl, Ellisvan Creveld, Smith-Lemi-Opitz and Meckel- Gruber. 1 Pre-axial is less common but is most likely associated with a syndrome such as Fanconi anaemia, trisomy 21, Hotl-Oram, VACTERL, and Carpenter syndrome 1.

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Case information

rID: 44472
Case created: 22nd Apr 2016
Last edited: 26th Apr 2016
Inclusion in quiz mode: Excluded

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