<prompt> All the following statement regarding this radiological film representing esophagus is true except?Squamous cell usually affects the upper two-thirdsAdenocarcinoma usually affects the lower-thirdLymph node involvement is a bad prognostic factorDysphagia is the most common and early presenting symptom  <response>: Ans. d Dysphagia is the most common and early presenting symptom.Carcinoma of the esophagus Squamous cell usually affects the upper two-thirds; adenocarcinoma usually affects the lower-third Common etiological factors are tobacco and alcohol squamous cell and GORD adenocarcinoma The incidence of adenocarcinoma is increasing Lymph node involvement is a bad prognostic factor Dysphagia is the most common presenting symptom, but is a late feature Accurate pretreatment staging is essential in patients thought to be fit to undergo curative treatmentImage source- stylefont-family: Times New Roman, Times, serif 