<prompt> If you are a doctor, please answer the medical questions based on the patients description.My serum amylase was 164, I am diagnosed with pancreatistis but in the CT scan no infection or inflammation was seen on pancreas. I had pain from last 17 days and the pain was unbearable so I smoked a weed joint 45 min prior to my ct scan-whole abdominal.Is weed the reason that nothing came up in the CT scan?  <response>: Hello Fairbanks for using Chat Doctor.come have evaluated your query thoroughly. Different possibilities are there for negative CT scan - Primary diagnosis is incorrect. - CT scan report may be changed with another patient. - Error in CT scan reporting. - Actual absence of swelling at the time of CT scan. - Technical issue from the machine itself to focus on pancreas maybe due to low capacity i.e.HZ Weed is not the reason for the same. Hope this clears your query. Welcome for any further assistance. Regards dear take care. 