The case is reportable because low-grade astrocytoma is a malignant tumor, and reportability requirements have not changed for malignant tumors. The 6th digit of the histology code is 2 because the histology is low-grade astrocytoma. The reference is ICD-O-3, page 39, second paragraph - "If the ICD-O 6th digit grade/differentiation code is to be used for central nervous system tumors, coders should give preference to terms from the diagnosis - such as low grade or anaplastic - rather than use the reported WHO grade". Low-grade is code 2, and the definition is found in FORDS, page 97. Kernohan grade is not coded as part of the histology.