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Case Example 3 (Primary Site and Histology)
Imaging states aggressive lytic lesion within posterior aspect of right seventh rib with multifocal cortical fenestration and fairly large soft tissue component 48mm. Biopsy was done on the rib confirming the histology 9680/3. Staged as 1E.
| Involvement | Comments |
|---|---|
| Lymph nodes | None seen |
| Organ involvement | Bone (rib) Although bone is a common metastatic site, this is the only site that is involved, plus it is not uncommon for DLBCL to occur de novo in the bone. The soft tissue component is due to the lymphoma, does not affect primary site |
| Common metastatic sites | None seen |
Coding of the case (Lymphoma schema)
| Data Item | Coding |
|---|---|
| M Rule | M2: Single histology |
| PH Rule | PH24: Organ involvement only |
| Primary Site | C413: Rib, sternum, clavicle and associated joints |
| Histology | 9680/3: DLBCL |
| Diagnostic confirmation | 1 (positive histology) |
| EOD Primary Tumor | 200 (confined to extralymphatic site) |
| EOD Regional Nodes | 888 (not applicable) |
| EOD Mets | 88 (not applicable) |
| Summary Stage | 1 (confined to extralymphatic site) |
| Mets at Dx Data Items (all 6) | 0 (no involvement) |
Updated: December 2, 2025