Cerebellar hypoplasia, a lack of development of the cerebellum, a part of the brain critical for controlling balance

Eye and eyelid defects

Heart defects

Cleft palate (uncommon in cats but occurs more often in Siamese)

Cryptorchidism (apparent absence of one or both testicles)

Polydactyly (more toes than normal; usually occurs on the front paws and rarely causes any problems for the cat)

Deafness associated with white fur and blue eyes