First thing is that you haven't commented on any post op symptoms. I assume you are having pain. Usually an MRCP would be done first. With no ductal dilation and normal labs sphincter of Oddi dysfunction would not be very likey - roughly 10-15% chance. The ERCP would not be looking for sphincter of Oddi dysfunction unless it was accompanied by sphincter of Oddi manometry. This is usually not indicated in type III SOD unless there has been an abnormal quantitative choledochoscintigraphy study.