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Classic cervical rib syndrome --> true neurogenic thoracic outlet syndrome

(Science: syndrome) Very chronic axon loss brachial plexopathy, caused by compromise of the lower trunk fibres by a congenital band extending from a rudimentary cervical rib to the first thoracic rib; rare disorder, found mostly in young to middle-aged women, that presents with unilateral hand wasting and weakness, particularly involving the lateral thenar eminence; sometimes accompanied by intermittent discomfort along the medial forearm and hand.

Synonym: cervical rib and band syndrome, classic cervical rib syndrome.