Vocal cord paralysis

This 61 y/o man was sent to our office by ENT for w/up of a vocal cord paralysis. He has had subacute-onset hoarseness for the past 2-3 months and ENT found a unilateral R vocal cord paralysis. He did a CT (see the images below), which only showed some mediastinal and hilar (R>L) adenopathy much of which is calcified.
He has had a PET scan which showed some very faint (SUV<4) style="display: block; text-align: center;" alt="" src="http://photos1.blogger.com/x/blogger/7040/842/320/933316/Vocal.jpg" border="0">