Difference between revisions of "Mastocytosis"

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'''Mastocytosis''' is the abundance of [[mast cells]].
{{ Infobox diagnosis
| Name      = {{PAGENAME}}
| Image      = Mastocytosis_-_cropped_-_very_high_mag.jpg
| Width      =
| Caption    = Mastocytosis. [[H&E stain]].
| Synonyms  =
| Micro      = mast cells (cells in the superficial/mid dermis that are: lymphocyte-like with more cytoplasm that is granular; cells may have spindled or stellate morphology); +/-eosinophils (common)
| Subtypes  =
| LMDDx      = [[intradermal nevus]]
| Stains    = [[Giemsa stain]] +ve
| IHC        = CD117 +ve, tryptase +ve
| EM        =
| Molecular  =
| IF        =
| Gross      =
| Grossing  =
| Site      = [[skin]]
| Assdx      =
| Syndromes  =
| Clinicalhx =
| Signs      =
| Symptoms  =
| Prevalence = not very common
| Bloodwork  =
| Rads      =
| Endoscopy  =
| Prognosis  = dependent on underlying cause
| Other      =
| ClinDDx    =
| Tx        = dependent on underlying cause
}}
'''Mastocytosis''' is the abundance of [[mast cells]]. It can be due to a number of causes.


==General==
==General==
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Notes:
Notes:
*Lymphocyte vs. mast cell:
*Lymphocyte versus mast cell:
**Lymphocytes = round; mast cells = ovoid.  
**Lymphocytes = round; mast cells = ovoid.  
DDx:
*[[Intradermal nevus]].
*[[Pleomorphic undifferentiated sarcoma]], [[Langerhans cell histiocytosis]] and other [[pleomorphic tumours]] - for ''aggressive systemic mastocytosis''.


===Images===
===Images===
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*[http://path.upmc.edu/cases/case409.html Systemic mastocytosis - several images (upmc.edu)].
*[http://path.upmc.edu/cases/case409.html Systemic mastocytosis - several images (upmc.edu)].
<gallery>
<gallery>
Image:Mastocytosis - intermed mag.jpg | Mastocytosis - intermed. mag. (WC)
Image:Mastocytosis_-_high_mag.jpg | Mastocytosis - high mag. (WC)
Image:Mastocytosis_-_high_mag.jpg | Mastocytosis - high mag. (WC)
Image:Mastocytosis_-_very_high_mag.jpg | Mastocytosis - very high mag. (WC)
Image:Mastocytosis_-_cropped_-_very_high_mag.jpg | Mastocytosis - very high mag. (WC)
Image:Mastocytosis_-_cropped_-_very_high_mag.jpg | Mastocytosis - very high mag. (WC)
</gallery>
</gallery>
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==Stains==
==Stains==
*[[Toluidine blue stain|Toluidine blue]] -- highlights the granules.
*[[Toluidine blue stain|Toluidine blue]] -- highlights the granules.
*[[Giemsa stain]] +ve


==IHC==
==IHC==

Latest revision as of 03:19, 20 March 2018

Mastocytosis
Diagnosis in short

Mastocytosis. H&E stain.

LM mast cells (cells in the superficial/mid dermis that are: lymphocyte-like with more cytoplasm that is granular; cells may have spindled or stellate morphology); +/-eosinophils (common)
LM DDx intradermal nevus
Stains Giemsa stain +ve
IHC CD117 +ve, tryptase +ve
Site skin

Prevalence not very common
Prognosis dependent on underlying cause
Treatment dependent on underlying cause

Mastocytosis is the abundance of mast cells. It can be due to a number of causes.

General

Classification:[1]

  1. Cutaneous (only) - usually children.
    • Urticaria pigmentosa.
    • Others.
  2. Systemic - usually adults.
    • Indolent subvariant.
    • Aggressive subvariant.
    • Leukemic subvariant.

Microscopic

Features:[2]

  • Cells in the superficial/mid dermis that are:
    • Lymphocyte-like with more cytoplasm that is granular.
      • Cells may have spindled or stellate morphology.
      • Tend to be more abundant around vessels.
  • +/-Eosinophils (common).
  • +/-Edema - often prominent; gives cells a white halo.

Notes:

  • Lymphocyte versus mast cell:
    • Lymphocytes = round; mast cells = ovoid.

DDx:

Images

www:

Stains

IHC

  • CD117 +ve.
  • Tryptase +ve.[3]

See also

References

  1. Arock, M.; Valent, P. (Aug 2010). "Pathogenesis, classification and treatment of mastocytosis: state of the art in 2010 and future perspectives.". Expert Rev Hematol 3 (4): 497-516. doi:10.1586/ehm.10.42. PMID 21083038.
  2. Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1185. ISBN 978-1416031215.
  3. Rudzki, Z.; Sotlar, K.; Kudela, A.; Starzak-Gwóźdź, J.; Horny, HP. (2011). "Systemic mastocytosis (SM) and associated malignant bone marrow histiocytosis - a hitherto undescribed form of SM-AHNMD.". Pol J Pathol 62 (2): 101-4. PMID 21866466.