Difference between revisions of "Plasma cell neoplasms"
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*Malignancy derived from the plasma cells. | *Malignancy derived from the plasma cells. | ||
*Prognosis: poor. | *Prognosis: poor. | ||
*Most common primary [[bone tumour]] in adults. | |||
Clinical:<ref name=Ref_PCPBoD8_323>{{Ref PCPBoD8|323}}</ref> | Clinical:<ref name=Ref_PCPBoD8_323>{{Ref PCPBoD8|323}}</ref> | ||
Revision as of 04:19, 1 August 2011
Plasma cell neoplasms arise from plasma cells. They are encountered by anatomical pathologists on occasion.
VL does not tease apart plasma cell myeloma, plasmacytoma and plasma cell neoplasm; the first two of these terms redirect to this article.
General
- Malignancy derived from the plasma cells.
- Prognosis: poor.
- Most common primary bone tumour in adults.
Clinical:[1]
- Bence Jones protein (urine).
- Abnormal protein electrophoresis (monoclonal gammopathy, dysproteinemia, paraproteinemia).
Note:
- Plasmacytoma = histology of multiple myeloma; to diagnose multiple myeloma other (non-pathology) criteria are needed.
Microscopic
Features:
- Abundant eosinophilic cytoplasm.
- Eccentrically placed nucleus.
- Usually with "clock face" morphology.
- "Clock face" morphology = chromatin clumps around the edge of the nucleus, like the numbers on a clock face.
- May have nucleoli.
- Usually with "clock face" morphology.
- Russell bodies:
- Eosinophilic, large (10-15 micrometres), homogenous immunoglobulin-containing inclusions.
- Dutcher bodies - intranuclear crystalline rods.
- Dutcher bodies are PAS stain +ve.[2]
- Image Dutcher bodies (hematologylibrary.org).
- Prominent perinuclear hof - cytoplasmic crescent shaped lucency adjacent to the nuclear membrane (due to large Golgi apparatus); nucleus has a "bib".
Images:
DDx:
- Neuroendocrine carcinoma - nucleus often has a plasmacytoid (plasma cell-like) appearance.
IHC
- Kappa -- usu. slightly stronger than lambda.
- Lambda.
- CD56.[3]
- Also +ve in NK/T cell lymphomas.
- CD57.
- Also +ve in T-cell large granular lymphocytic leukemia.[4].
- CD138.
- CD38. (???)
Molecular
See also
References
- ↑ Mitchell, Richard; Kumar, Vinay; Fausto, Nelson; Abbas, Abul K.; Aster, Jon (2011). Pocket Companion to Robbins & Cotran Pathologic Basis of Disease (8th ed.). Elsevier Saunders. pp. 323. ISBN 978-1416054542.
- ↑ URL: http://www.thefreelibrary.com/Dutcher+bodies+in+chronic+synovitis-a083551789. Accessed on: 4 August 2010.
- ↑ URL: http://www.ncbi.nlm.nih.gov/omim/116930. Accessed on: 31 August 2010.
- ↑ URL: http://www.nature.com/bmt/journal/v33/n1/full/1704298a.html. Accessed on: 31 August 2010.
- ↑ Chesi, M.; Nardini, E.; Lim, RS.; Smith, KD.; Kuehl, WM.; Bergsagel, PL. (Nov 1998). "The t(4;14) translocation in myeloma dysregulates both FGFR3 and a novel gene, MMSET, resulting in IgH/MMSET hybrid transcripts.". Blood 92 (9): 3025-34. PMID 9787135.
- ↑ Keats, JJ.; Reiman, T.; Maxwell, CA.; Taylor, BJ.; Larratt, LM.; Mant, MJ.; Belch, AR.; Pilarski, LM. (Feb 2003). "In multiple myeloma, t(4;14)(p16;q32) is an adverse prognostic factor irrespective of FGFR3 expression.". Blood 101 (4): 1520-9. doi:10.1182/blood-2002-06-1675. PMID 12393535.
- ↑ Mitchell, Richard; Kumar, Vinay; Fausto, Nelson; Abbas, Abul K.; Aster, Jon (2011). Pocket Companion to Robbins & Cotran Pathologic Basis of Disease (8th ed.). Elsevier Saunders. pp. 317. ISBN 978-1416054542.