<prompt> Which of the following is not done in carcinoma esophagus?BiopsypH - metrymonitoringCT chestPET scan  <response>: CARCINOMA ESOPHAGUS: Squamous cell carcinoma of esophagus usually affects the upper two thirds;whereas, adenocarcinoma usually affects lower third of esophagus. Tobacco, alcohol, GERD Obesity are some of the common etiological features. Bad prognosis if lymph nodes are involved. The most common presenting symptom is Dysphagia. INVESTIGATIONS: 1st investigation - Barium Swallow IOC for Dx - Endoscopy with biopsy IOC for staging - EUS IOC for staging in cases of obstructed lumen advanced stage: CECT IOC for distant metastasis - PET Scan 