Lyngstadaas syndrome
Other names	Steroid dehydrogenase deficiency-dental anomalies syndrome
This condition is inherited in an autosomal recessive manner.

Lyngstadaas syndrome, also known as severe dental aberrations in familial steroid dehydrogenase deficiency,^[1] is a rare autosomal recessive liver disease involving an enzyme (steroid dehydrogenase) deficiency and dental anomalies.^[2][3] The disease is named after the Norwegian professor Ståle Petter Lyngstadaas.

Lyngstadaas syndrome is an autosomal recessive liver disease.^[4]

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Office of Rare Diseases listed Lyngstadaas syndrome as a "rare disease". This means that Lyngstadaas syndrome, or a subtype of Lyngstadaas syndrome, affects less than 200,000 people in the US population. ^{[citation needed]}

Orphanet, a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Lyngstadaas syndrome as a "rare disease".^{[citation needed]}

• Rare disease