Crossed polysyndactyly

What it is

A rare, hereditary, congenital limb malformation characterized by polydactyly with crossed involvement of hands and feet with no other associated malformations or anomalies. Patients present with a combination of unilateral or bilateral preaxial polydactyly of hands with postaxial polydactyly of feet or postaxial polydactyly of hands with preaxial polydactyly of feet. Additional manifestations include bilateral cutaneous syndactyly of first, second and third toes and occasionally cutaneous syndactyly of hands.

Key facts

Prevalence

<1 / 1 000 000

Age of onset

Antenatal

Inheritance

Autosomal dominant

Classified as

Malformation syndrome

Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.

Signs and symptoms

These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.

ICD-10 codes

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Cross-references