Case Example 10 (Multiple Primary, Histology and Primary Site)

Inguinal lymph node biopsy, Nodal T follicular helper cell lymphoma, w/ concomitant B-cell lymphoma.

No other information available.

Involvement Comments
Lymph nodes Inguinal lymph nodes
Organ involvement Unknown
Common metastatic sites Unknown

Coding of the case (Lymphoma schema)

Data Item Coding
M Rule M4-Code one primary when 2 or more non-Hodgkin lymphomas are in the same lymph node (same location, same biopsy).
See Rule PH15
PH Rule PH15: Code the higher ICD-O-3 code when one of the histologies is NOT diffuse large B-cell lymphoma
PH22: Code primary site to lymph nodes, NOS when lymph nodes are involved and there is no other information
Primary site C779 (Lymph nodes, NOS)
Histology 9702/3: Peripheral T-cell lymphoma (Nodal T follicular helper cell lymphoma is an alternate name)
Diagnostic confirmation 1 (positive histology)
EOD Primary Tumor 100 (single lymph node region involved)
EOD and SS state “code what you know.” We know at least one lymph node region is involved
EOD Regional Nodes 888 (not applicable)
EOD Mets 88 (not applicable)
Summary Stage 1 (single lymph node region involved)
EOD and SS state “code what you know.” We know at least one lymph node region is involved
Mets at Dx Data Items (all 6) Mets at Dx Distant lymph nodes 8 (not applicable for lymph node primaries), All Other mets at Dx fields 9*

*There is no further information regarding this case, so coding unknown for the remaining mets at dx fields is correct. These can be updated if further information is found.

Updated: December 2, 2025