Additional Study Information: This study is for individuals who have Cushings disease and want to join voluntarily in this study to find out if a study drug called osilodrostat (LCI699) is safe and has beneficial effects in people who have Cushings disease. Cushings disease is a rare but debilitating disease. Cushings disease is caused by a benign tumor of the pituitary gland. The tumor causes the adrenal glands to secrete too much of a hormone called cortisol. Most of the harmful effects in Cushings disease are the result of too much cortisol. The purpose of this study is to confirm the effectiveness and safety of osilodrostat in treating patients with this medical condition.