Congenital ichthyosis is a skin condition in which the outer layer of the skin does not form properly and results in scaling. The condition often progresses to large patches of thickened, black, scaly skin.
Neuronal ceroid lipofuscinosis results from the accumulation of granules in the neurons of the brain and spinal cord. This progressive neurological disorder manifests as behavioral changes coupled with a loss of coordination and blindness.
Sensory ataxic neuropathy is a progressive neurological disorder characterized by involuntary muscle movements and abnormal posture resulting from degeneration of the nerves controlling muscle movement. It affects both sexes but is only inherited maternally.