Myasthenia gravis and primary biliary cirrhosis. Common immunological features and rare coincidence.

A 43-year-old woman with recently diagnosed primary biliary cirrhosis developed antibody-negative myasthenia gravis. She did not receive D-penicillamine therapy. Clinical and immunological features of this patient are discussed. In previous reports on an association between primary biliary cirrhosis and myasthenia D-penicillamine treatment was an obligate causal linkage between both disorders.