what does Pan2B mean in MRCP report?

With so little information provided, I can only make the assumption an MRI/MRCP scan was done detecting a lesion or it was a flow-up scan for a known primary tumor.

Tumors are staged by three characteristics-size represented by the letter “T” followed by a number (1, 2 or 3). In the TNM staging system for pancreatic cancer, a tumor described as T2 falls within the size range of larger than 2 centimeters (cm) but no larger than 4 centimeters (cm) in its greatest dimension. This tumor size is still considered to be contained within the pancreas and has not grown into the major nearby blood vessels.

This limited staging is referred to as clinical staging…what is observable in a clinic setting. It is part of the T/N/M staging system with N for number of lymph nodes involved and M indicating Metastatic disease. Each of those letters will have either an “x” indicating the result was not determined or is pending or a number representing the degree of involvement. The same applies to M where the presence of an “x” means pending/not determined or a number representing a range of values.

A more accurate staging occurs after surgery when lymph nodes are harvested as part of a resection, examined by a pathologist and indicated on the surgical pathology report. A “p” may precede the TNM staging to indicate it is the more accurate pathology staging as opposed to a “c” indicating clinical observation only.