SADDAN

Beskrivning

SADDAN (severe achondroplasia with developmental delay and acanthosis nigricans) is a rare disorder of bone growth characterised by skeletal, brain, and skin abnormalities.

All people with this condition have extremely short stature with particularly short arms and legs. Other features include unusual bowing of the leg bones; a small chest with short ribs and curved collar bones; short, broad fingers; and folds of extra skin on the arms and legs. Structural abnormalities of the brain cause seizures, profound developmental delay, and intellectual disability. Several affected individuals also have had episodes in which their breathing slows or stops for short periods (apnea). Acanthosis nigricans, a progressive skin disorder characterised by thick, dark, velvety skin, is another characteristic feature of SADDAN that develops in infancy or early childhood.

Inheritance patterns

The source lists the following possible inheritance patterns: Autosomal dominant. More than one pattern can apply in different cases.

Related genes

• FGFR3

Other names

Achondroplasia, severe, with developmental delay and acanthosis nigricans

SADDAN dysplasia

Severe achondroplasia with developmental delay and acanthosis nigricans

Skeleton-skin-brain syndrome

SSB syndrome