<prompt> Pachydermia laryngitis - MC site of involvementVestibular foldArytenoid cailageAnterior 13 commissurePosterior 13 and anterior 13 commissure  <response>: Pachyderma laryngitis affects the medial surface of arytenoid cailage, in paicular the vocal processes. Ref:- Scott;s Brown 7th edition; pg num:- 2196 