Site & Histology Exercise
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Site Code: C71.1
Pathology report from tumor resection confirms malignancy of right frontal lobe brain mass.
Histology Code: 9400/32
Frontal lobe tumor resection pathology report states low grade astrocytoma. Code histologic grade = 2. (Reference: SEER Program Coding and Staging Manual 2004, pg. 94, "Three-Grade Conversion Table".) Do not use the WHO grade to code histologic grade. Code the WHO grade in CS Site-Specific Factor 1 for this primary site.