Difference between revisions of "Hairy cell leukemia"

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m (BRAF and references)
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*Good prognosis (with treatment), though (likely) not curable.
*Good prognosis (with treatment), though (likely) not curable.


===Gross===
==Gross==
Features:<ref name=Ref_PCPBoD8_326>{{Ref PCPBoD8|326}}</ref>
Features:<ref name=Ref_PCPBoD8_326>{{Ref PCPBoD8|326}}</ref>
*Huge beefy red [[spleen]].
*Huge beefy red [[spleen]].
**Red as white pulp obliterated.
**Red as white pulp obliterated.


===Microscopic===
==Microscopic==
Features:<ref>URL: [http://emedicine.medscape.com/article/200580-diagnosis http://emedicine.medscape.com/article/200580-diagnosis]. Accessed on: 18 August 2010.</ref>
Features:<ref>URL: [http://emedicine.medscape.com/article/200580-diagnosis http://emedicine.medscape.com/article/200580-diagnosis]. Accessed on: 18 August 2010.</ref>
*Small cells (10-20 micrometers) with "Fried egg"-like appearance:
*Small cells (10-20 micrometers) with "Fried egg"-like appearance:
Line 26: Line 26:
*[[Hepatosplenic T-cell lymphoma]].
*[[Hepatosplenic T-cell lymphoma]].


====Images====
===Images===
<gallery>
<gallery>
Image:Hairy_cell_leukemia.jpg | HCL - blood film. (WC)
Image:Hairy_cell_leukemia.jpg | HCL - blood film. (WC)
Line 38: Line 38:
*[http://webpathology.com/image.asp?case=380&n=3 HCL in the spleen (webpathology.com)].
*[http://webpathology.com/image.asp?case=380&n=3 HCL in the spleen (webpathology.com)].


===IHC===
==IHC==
Features:<ref>URL: [http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=cmed&part=A34022&rendertype=table&id=A34029 http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=cmed&part=A34022&rendertype=table&id=A34029]. Accessed on: 20 August 2010.</ref>
Features:<ref>URL: [http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=cmed&part=A34022&rendertype=table&id=A34029 http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=cmed&part=A34022&rendertype=table&id=A34029]. Accessed on: 20 August 2010.</ref>
*CD20 +ve, CD11c+ve, CD25 +ve, CD103 +ve, CD123 +ve, cyclin D1 +ve, DBA44 +ve
*CD20 +ve, CD11c+ve, CD25 +ve, CD103 +ve, CD123 +ve, cyclin D1 +ve, DBA44 +ve
Line 48: Line 48:
*CD19 +ve, CD11c +ve, FMC7 +ve.
*CD19 +ve, CD11c +ve, FMC7 +ve.


===References===
==See also==
*[[Small cell lymphomas]].
 
==References==
{{Reflist}}
{{Reflist}}


[[Category: Haematopathology]]
[[Category: Haematopathology]]

Revision as of 18:26, 17 June 2018

High power magnification of a bone marrow trephine showing infiltration by hairy cell leukaemia.

Indolent B-cell neoplasm, abbreviated HCL. Named for the appearances on peripheral blood smears. The vast majority (>95%) harbour the BRAF V600E mutation.[1] Mutations in other parts of the BRAF gene are described, but rare.[2]

In the bone marrow, they are associated with heavy reticulin fibrosis, commonly resulting in dry taps.[3]

Clinical:[4]

  • Pancytopenia. Monocytopenia common in earlier disease.
  • Splenic enlargement.
  • No lymphadenopathy.
  • Good prognosis (with treatment), though (likely) not curable.

Gross

Features:[5]

  • Huge beefy red spleen.
    • Red as white pulp obliterated.

Microscopic

Features:[6]

  • Small cells (10-20 micrometers) with "Fried egg"-like appearance:
    • Well-demarcated fuzzy cell borders,
    • Clear/whispy cytoplasm and,
    • Central round nucleus.
      • Peri-nuclear clearing ("water-clear rim"[7]) -- key feature.

DDx:

Images

  • HCL - blood film. (WC)

  • HCL - high mag. (WC)

  • HCL - very high mag. (WC)

www:

IHC

Features:[8]

  • CD20 +ve, CD11c+ve, CD25 +ve, CD103 +ve, CD123 +ve, cyclin D1 +ve, DBA44 +ve
  • Annexin A1 +ve (only useful in heavy bone marrow infiltration as it is also positive in T-cells and granulopoietic cells)
  • BRAF V600E mutation-specific antibody
  • CD5 -ve.

Flow cytometry:

  • CD19 +ve, CD11c +ve, FMC7 +ve.

See also

References

  1. ↑ Ahmadzadeh, A.; Shahrabi, S.; Jaseb, K.; Norozi, F.; Shahjahani, M.; Vosoughi, T.; Hajizamani, S.; Saki, N. (Sep 2014). "BRAF Mutation in Hairy Cell Leukemia.". Oncol Rev 8 (2): 253. doi:10.4081/oncol.2014.253. PMID 25992240.
  2. ↑ Tschernitz, S.; Flossbach, L.; Bonengel, M.; Roth, S.; Rosenwald, A.; Geissinger, E. (May 2014). "Alternative BRAF mutations in BRAF V600E-negative hairy cell leukaemias.". Br J Haematol 165 (4): 529-33. doi:10.1111/bjh.12735. PMID 24433452.
  3. ↑ Galani, KS.; Subramanian, PG.; Gadage, VS.; Rahman, K.; Ashok Kumar, MS.; Shinde, S.; Mahadik, S.; Ansari, R. et al. "Clinico-pathological profile of Hairy cell leukemia: critical insights gained at a tertiary care cancer hospital.". Indian J Pathol Microbiol 55 (1): 61-5. doi:10.4103/0377-4929.94858. PMID 22499303.
  4. ↑ URL: http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=cmed&part=A34022. Accessed on: 20 August 2010.
  5. ↑ 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. 326. ISBN 978-1416054542.
  6. ↑ URL: http://emedicine.medscape.com/article/200580-diagnosis. Accessed on: 18 August 2010.
  7. ↑ URL: http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=cmed&part=A34022. Accessed on: 20 August 2010.
  8. ↑ URL: http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=cmed&part=A34022&rendertype=table&id=A34029. Accessed on: 20 August 2010.
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