Difference between revisions of "Myoepithelial carcinoma"

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==General==
==General==
*Rare.
*Rare.
*Often misdiagnosed as "benign".<ref name=pmid30789358>


==Microscopic==
==Microscopic==

Revision as of 01:44, 19 March 2019

Myoepithelial carcinoma, abbreviated MECA a rare malignant salivary gland tumour.[1] It is the malignant counterpart of myoepithelioma.

General

  • Rare.
  • Often misdiagnosed as "benign".Cite error: Closing </ref> missing for <ref> tag
  • Myoepithelial cells - may be cytologically very bland.
  • Hypocellular centre (hyaline or myxoid) and hypercellular periphery.
  • Pushing border ("expansile nodular lobulated pattern").
  • No ductal structures.

Note:

  • Overt features of malignancy (necrosis, nuclear atypia, infiltrative growth, proliferation) absent.

DDx:

IHC

  • CAM5.2 +ve.

Molecular

  • +/-Fusions with PLAG1 gene.[2]
  • +/-EWSR1 gene rearrangement.[3]

See also

References

  1. Kong, M.; Drill, EN.; Morris, L.; West, L.; Klimstra, D.; Gonen, M.; Ghossein, R.; Katabi, N. (Jul 2015). "Prognostic factors in myoepithelial carcinoma of salivary glands: a clinicopathologic study of 48 cases.". Am J Surg Pathol 39 (7): 931-8. doi:10.1097/PAS.0000000000000452. PMID 25970687.
  2. Dalin, MG.; Katabi, N.; Persson, M.; Lee, KW.; Makarov, V.; Desrichard, A.; Walsh, LA.; West, L. et al. (10 2017). "Multi-dimensional genomic analysis of myoepithelial carcinoma identifies prevalent oncogenic gene fusions.". Nat Commun 8 (1): 1197. doi:10.1038/s41467-017-01178-z. PMID 29084941.
  3. Thway, K.; Bown, N.; Miah, A.; Turner, R.; Fisher, C. (Jun 2015). "Rhabdoid Variant of Myoepithelial Carcinoma, with EWSR1 Rearrangement: Expanding the Spectrum of EWSR1-Rearranged Myoepithelial Tumors.". Head Neck Pathol 9 (2): 273-9. doi:10.1007/s12105-014-0556-2. PMID 24993038.