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Websites for computer-aided syndrome diagnosis

Links to powerful commercial and freely-available resources for this purposeare provided here.

OMIM

Online Mendelian Inheritance in Man.

Phenomizer

Freely available but not expert-curated.

Website providing details of how to purchase this database. This resource, although not free, is expert-curated and provides many carefully selected photographs.
Possum database
Another database that, although requiring purchase, is useful for the diagnosis of dysmorphic cases.
Orphanet

Freely available. It contains a new facility for searching by clinical sign.

For more details and for a user's guide on how to make the most efficient use of these databases, see Part 3 of Essential Medical Genetics 6th Edition