<prompt> Commonest complication of Zenkers diverticulum isDysphoniaGastroesophageal refluxLung abscessPerforation  <response>: Pulmonary infection is the most frequent serious complication, and many patients are first seen after experiencing repeated episodes of pneumonia.-CSDTAspiration pneumonia Lung abscess are the most frequent complications of Zenkers diverticulum.Other rare complications are:PerforationBleedingCarcinoma 