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CD138: plasma cells are positive interstititally, <<5% of cellularity.
This bone marrow biopsy shows morphological evidence of a plasma cell infiltrate of <5% of cellularity, as confirmed on immunohistochemical staining.
Bone marrow haemopoietic reserve is mildly decreased.
C90.0 Multiple myeloma
M8000/3 Neoplasm, malignant, primary site

July 10 (edited)
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MyMyelomaTeam

It's completely understandable to feel uncertain when faced with medical terminology — let's break this down into plain language.

CD138 positive plasma cells interstitially, <5% of cellularity means
- CD138 is a protein marker used to identify plasma cells
- "Interstitially" means the plasma cells are scattered throughout Show Full Answer

It's completely understandable to feel uncertain when faced with medical terminology — let's break this down into plain language.

CD138 positive plasma cells interstitially, <5% of cellularity means:
- CD138 is a protein marker used to identify plasma cells
- "Interstitially" means the plasma cells are scattered throughout the bone marrow rather than forming clusters
- Less than 5% of the cells seen in the biopsy are plasma cells

In a healthy bone marrow, plasma cells normally make up less than 5% of cells, so this finding sits at the boundary of what's considered normal. "Morphological evidence of plasma cell infiltrate" simply means that under the microscope, there are visible signs of plasma cells present in the marrow tissue.

"Immunohistochemical staining confirmed" means a special dye test was used to double-check and confirm what was seen visually.

"Haemopoietic reserve mildly decreased" means the bone marrow's ability to produce healthy blood cells is slightly reduced. Overall, these results suggest a low-level plasma cell presence. However, interpreting what this means for treatment or diagnosis really needs to be discussed with the specialist, as they'll consider this alongside other test results like blood protein levels and imaging.

It would be worth writing down any questions before that appointment — no question is too small!

July 10

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