[Familial brachial plexus pathologies of tomaculous origin].

Two further cases of familial brachial plexus syndrome related to a tomacular neuropathy are reported, adding to the ten-odd known cases of this disorder. The principal characteristics are: onset on wakening or during abnormal posture, indolence, recurrences and associated electromyographic features of diffuse neuropathy. These features differentiate this affection from familial forms of shoulder neuralgic amyotrophy.