Kocher–Debre–Semelaigne syndrome

Kocher–Debré–Semelaigne syndrome (KDSS) is hypothyroidism in infancy or childhood characterised by lower extremity or generalized muscular hypertrophy (Herculean appearance), myxoedema, short stature, and cognitive impairment.

The syndrome is named after Emil Theodor Kocher, Robert Debré and Georges Semelaigne. Also known as Debré–Semelaigne syndrome or cretinism-muscular hypertrophy, hypothyroid myopathy, hypothyroidism-large muscle syndrome, hypothyreotic muscular hypertrophy in children, infantile myxoedema-muscular hypertrophy, myopathy-myxoedema syndrome, myxoedema-muscular hypertrophy syndrome, myxoedema-myotonic dystrophy syndrome.

The adult-onset form of this syndrome is Hoffmann syndrome. Some sources claim that two of the differentiating symptoms between KDSS and Hoffmann syndrome is that Hoffmann syndrome lacks painful spasms and pseudomyotonia; however, this claim is in conflict with other sources that list these symptoms as also being present in Hoffmann syndrome.