<prompt> A patient with hoarseness of voice was found to be having pachydermia laryngis. All of the following are true except:It is a hyperkeratotic lesion present within the anterior two-third of the vocal cordsIt is not premalignant lesionDiagnosis is made by biopsyOn microscopy it shows acanthosis and hyperkeratosis  <response>: Pachydermia laryngis is a hyperkeratotic lesion involving posterior part of larynx. It is not premalignant. Biopsy is essential to exclude tuberculosis and cancer. 