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Cerebral gigantism

Sotos syndrome (also known as cerebral gigantism) is a rare genetic disorder characterized by excessive physical growth during the first 2 to 3 years of life. The disorder may be accompanied by mild mental retardation, delayed motor, cognitive, and social development, hypotonia (low muscle tone), and speech impairments. Children with Sotos syndrome tend to be large at birth and are often taller, heavier, and have larger heads (macrocrania) than is normal for their age. Symptoms of the disorder, which vary among individuals, include a disportionately large and long head with a slightly protrusive forehead, large hands and feet, hypertelorism (an abnormally increased distance between the eyes), and downslanting eyes. more...

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Clumsiness, an awkward gait, and unusual aggressiveness or irritability may also occur. Although most cases of Sotos syndrome occur sporadically, familial cases have also been reported.

Incidence

Incidence is approximately 1 in 14,000 births.

Description

Characterized by overgrowth and advanced bone age. Affected individuals are dysmorphic with macrodolichocephaly, downslanting palpebral fissures and a pointed chin. They have motor and speech delays but typically have normal intelligence.

Genetics

Most reported cases of Sotos syndrome have been sporadic and may represent new dominant mutations.

Treatment

There is no standard course of treatment for Sotos syndrome. Treatment is symptomatic.

Prognosis

Sotos syndrome is not a life-threatening disorder and patients may have a normal life expectancy. The initial abnormalities of Sotos syndrome usually resolve as the growth rate becomes normal after the first few years of life. Developmental delays may improve in the school-age years, however, coordination problems may persist into adulthood.

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