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Many people with Marfan syndrome grow to above-average height, and some have disproportionately long, slender limbs with thin, weak wrists and long fingers and toes. The Steinberg sign, also known as the thumb sign, is one of the clinical examination tests for Marfan disease in the hands.
This feature can occur on its own with no underlying health problems, or it can be associated with certain medical conditions, including Marfan syndrome, [1] Ehlers–Danlos syndromes, [2] Loeys–Dietz syndrome, and homocystinuria. [3]
Marfanoid (or Marfanoid habitus) is a constellation of signs resembling those of Marfan syndrome, including long limbs, with an arm span that is at least 1.03 of the height of the individual, and a crowded oral maxilla, sometimes with a high arch in the palate, arachnodactyly, and hyperlaxity.
Joint hypermobility syndrome shares symptoms with other conditions such as Marfan syndrome, Ehlers-Danlos Syndrome, and osteogenesis imperfecta. Experts in connective tissue disorders formally agreed that severe forms of Hypermobility Syndrome and mild forms of Ehlers-Danlos Syndrome Hypermobility Type are the same disorder. [citation needed]
However, if there is widespread laxity of other connective tissue, then this may be a sign of Ehlers–Danlos syndrome, Down syndrome, Klippel–Feil syndrome, juvenile idiopathic arthritis, Larsen syndrome, Marfan syndrome, osteogenesis imperfecta, and other medical conditions. [1] [2]
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Congenital contractural arachnodactyly (CCA), also known as Beals–Hecht syndrome, is a rare autosomal dominant congenital connective tissue disorder. [1] As with Marfan syndrome , people with CCA typically have an arm span that is greater than their height and very long fingers and toes . [ 2 ]
Dennie–Marfan syndrome is a syndrome in which there is association of spastic paraplegia of the lower limbs and mental retardation in children with congenital syphilis. [1] Both sexes are affected, and the onset of the disease can be acute or insidious, with slow progression from weakness to quadriplegia .