Thumb sign | definition of thumb sign by Medical dictionary
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Related to thumb sign: croup
Etymology: AS, thuma + L, signum
A finding in patients with Marfan syndrome and other inherited connective tissue disorders. The thumb sign is positive if the distal phalanx of the thumb can be opposed beyond the ulnar border of the palm
the flexing of the terminal phalanx of the thumb against the flexed index finger, as in holding a piece of paper. It is observed in patients who are unable to adduct the thumb because of an ulnar lesion. Also called Froment's sign, newspaper sign, signe de journal
Protrusion of the thumb across the palm and beyond the clenched fist; seen in Marfan syndrome.