<s>[INST] If a patient has aleady had a CT Scan why would the doctor order an EUS? Ia it because he has seen something, This patient has a tumor is his esophagus. mid way between his throat and stomach. Also the biopsie was taken on Friday and he has not gotten the results if it is cancerous. How long does it take to get a biopsie reading back. Thanks [/INST] Hi, Thanks for writing in. The use of EUS of endoscopic ultrasound in a patient who is confirmed with esophageal cancer is helpful in staging of the cancer. It is possible that the cancer is still operable, and the doctor wants to know the infiltration of esophageal cancer in to the surrounding vessels and tissues. The endoscopic ultrasound shows layers of the wall of esophagus and this is a good way to study it. The EUS and biopsy might take 30 minutes. The biopsy reading usually takes 2 to 3 days in most patients and if special stains have to be done then it might take a week. Please do not worry. </s>