What histologic features seen in CRCs can predict MSI H

What histologic features seen in CRCs can predict MSI H? 

These tumors are usually right sided, show a medullary or syncytial growth pattern, have mucinous or signet ring cell features, are poorly differentiated, and show lymphocytic infiltration. Also, a Crohn-like reaction (nodular lymphoid aggregates) is seen beyond the advancing edge of the tumor. These features, along with the age at diagnosis, are used to determine the microsatellite instability by pathology score.

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