We present a rare case ofCushing syndrome resultingfrom thymic carcinoid of thelung. Although Cushing syndromeis not usually associatedwith respiratory muscleweakness or restriction, ourpatient had reduced lung volumesand expiratory muscleweakness. His reduced lungvolumes could not be completelyexplained by respiratorymuscle weakness, parenchymallung disease, or obesity.Six months after removal ofthe carcinoid tumor, the patient'sgrowth hormone leveland the lung volumes improvedsignificantly, and hebecame asymptomatic.
