Polydactyly or polydactylism (from Greek πολύς (polys) 'many', and δάκτυλος (daktylos) 'finger'), also known as hyperdactyly, is an anomaly in humans and animals resulting in supernumerary fingers and/or toes. Polydactyly is the opposite of oligodactyly (fewer fingers or toes). [Source: Wikipedia ]

Crossed polydactyly
Postaxial polydactyly
Preaxial polydactyly
May Cause
Delta phalanx
May Be Caused by
Absent tibia - polydactyly
Absent tibia - polydactyly - arachnoid cyst
Acro-cranio-facial dysostosis
Acro-fronto-facio-nasal dysostosis
Acrocallosal syndrome
Acrorenal syndrome
Asphyxiating thoracic dysplasia
Bardet-Biedl syndrome
Biemond syndrome type 2
Bifid epiglottis-polydactyly syndrome
BRESEK syndrome
Cardiac defects - laryngeal anomalies - polydactyly - colonic aganglionosis
Carpenter syndrome
Catel-Manzke syndrome
Cerebrorenodigital syndrome
CHAR syndrome
Cortical blindness - intellectual deficit - polydactyly
Cutis tricolor neurocutaneous malformation syndrome
Disorganization complex
Ectrodactyly - polydactyly
Ellis-van Creveld syndrome
Familial crossed polysyndactyly
Fuhrmann syndrome
Goltz syndrome
Greig cephalopolysyndactyly syndrome
Hepatic fibrocystic disease and polydactyly
Hirschsprung disease - deafness - polydactyly
Hydrolethalus syndrome
Intellectual deficit - polydactyly - uncombable hair
Kaufman-McKusick syndrome
Laurin-Sandrow syndrome
Macrocephaly-cutis marmorata telangiectasia syndrome
Meckel syndrome
Mesomelic dysplasia Werner type
Microcephaly-facial clefting-polydactyly syndrome
MPPH syndrome
Mullerian derivatives - lymphangiectasia - polydactyly
Multinodular goiter - cystic kidney - polydactyly
OFD-plus syndrome
Opitz trigonocephaly syndrome
Orofaciodigital syndrome type 2
Orofaciodigital syndrome type 3
Orofaciodigital syndrome type 4
Pallister-Hall syndrome
PIV syndrome
Pseudotrisomy 13 syndrome
Rubinstein-Taybi syndrome
Sandrow syndrome
Short rib-polydactyly syndrome
Smith-Lemli-Opitz syndrome
Trisomy 13
Weyers acrodental dysostosis