What is the size of the lesion?
No follow-up imaging. Will recommend endoscopic ultrasound/FNA instead.
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Notes:
Radiologists have the option to recommend endoscopic ultrasound/FNA instead of follow-up imaging in this situation. If the lesion is associated with mild MPD dilatation (2-7 mm), a lot of time one cannot differentiate between combined form IPMN (both side branch and MPD involved) versus pure branch duct form IPMN (the dilatation of the MPD is due to secreted mucus plugging the duct). In this case, it may be prudent to recommend endoscopic ultrasound/FNA directly. Also, if the lesion is relative big (close to 2.5 cm) or has been growing relatively fast, it may be prudent to recommend endoscopic ultrasound/FNA directly.
The size of the cyst is a single measurement of the greatest length of the cyst in the long axis on either the axial or coronal images.