Atrophy of the intrinsic musculature of the hands associated with the use of botulinum toxin-A injections for hyperhidrosis: a case report and review of the literature.

Botulinum toxin type A (BTX-A) has been used therapeutically for the treatment of spastic disorders for many years. More recently, the therapeutic utility of BTX-A in the treatment of hyperhidrosis has been recognised. While studies have reported on the efficacy of BTX-A in managing hyperhidrosis, long term data are required in order for the treatment implications to be fully appreciated. We report on a case of severe atrophy of the intrinsic muscles of the hands in a patient treated with intra-palmar BTX-A (Dysport, Speywood, UK) injections for hyperhidrosis. To our knowledge this has not been described in the literature before.