+ Multiple osseous or medullary plasmacytomas (9731) + Multiple extraosseous or extramedullary plasmacytomas (9734) + Single plasmacytoma occurring outside of bone (extraosseous or extramedullary) (9731) Single plasmacytoma occurring in bone (osseous or medullary) (9731) These are systemic diseases and should always be coded 7. **Note 4:** Lymphoplasmacytic lymphoma (9671) and Waldenstrom Macroglobulinemia (9761) are now collected with the plasma cell disorders. It is always coded to 7 for systemic involvement. **Note 3:** Plasma cell myeloma/multiple myeloma (9732) is a widely disseminated plasma cell neoplasm, characterized by a single clone of plasma cells derived from B cells that grows in the bone marrow. **Note 2:** Codes 0, 2, and 4 are not applicable for this chapter. Used with permission of the American College of Surgeons, Chicago, Illinois. * Chapter 82 *Plasma Cell Myeloma and Plasma Cell Disorder*, in the AJCC Cancer Staging Manual, Eighth Edition (2017) published by Springer International Publishing. * Collaborative Stage Data Collection System, version 02.05: * SEER Summary Staging Manual-2000: Codes and Coding Instructions () * SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998) () **Note 1:** The following sources were used in the development of this chapter Notes **Myeloma and Plasma Cell Disorders**ĩ671 Lymphoplasmacytic lymphoma (except C441, C690, C695-C696)ĩ732 Plasma cell myeloma/multiple myelomaĩ734 Plasmacytoma, extramedullary (except C441, C690, C695-C696)
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