[Kennedy disease: report of 2 cases].

We report two cases of Kennedy's disease (muscle weakness, amyotrophy, intentional tremor, endocrine abnormalities, and denervation signs at electromyography). This entity must be differentiated from other motor neuron disorders by the genetic pattern (X-liked recessive), gynecomastia, testicular atrophy, oligospermia and good prognosis. A discussion about the clinical pattern and evolution is made.