Sandbox:Maneesha: Difference between revisions

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==Epidemiology and Demographics==
==Epidemiology and Demographics==


==Causes==
*The exact causes of Pleomorphic adenoma are unknown but the tumor has been found to increase 15-20 years after radiation exposure.
*Simian virus(SV40) may play a role in the development of Pleomorphic adenoma.<ref name="pmid12368186">{{cite journal |vauthors=Martinelli M, Martini F, Rinaldi E, Caramanico L, Magri E, Grandi E, Carinci F, Pastore A, Tognon M |title=Simian virus 40 sequences and expression of the viral large T antigen oncoprotein in human pleomorphic adenomas of parotid glands |journal=Am. J. Pathol. |volume=161 |issue=4 |pages=1127–33 |date=October 2002 |pmid=12368186 |pmc=1867276 |doi=10.1016/S0002-9440(10)64389-1 |url=}}</ref>
==Risk factors==
==Risk factors==
*Prior head and neck irradiation is a risk factor for the development of Pleomorphic adenoma.<ref name="pmid30028745">{{cite journal |vauthors=Gündüz AK, Yeşiltaş YS, Shields CL |title=Overview of benign and malignant lacrimal gland tumors |journal=Curr Opin Ophthalmol |volume=29 |issue=5 |pages=458–468 |date=September 2018 |pmid=30028745 |doi=10.1097/ICU.0000000000000515 |url=}}</ref>
*Prior head and neck irradiation is a risk factor for the development of Pleomorphic adenoma.<ref name="pmid30028745">{{cite journal |vauthors=Gündüz AK, Yeşiltaş YS, Shields CL |title=Overview of benign and malignant lacrimal gland tumors |journal=Curr Opin Ophthalmol |volume=29 |issue=5 |pages=458–468 |date=September 2018 |pmid=30028745 |doi=10.1097/ICU.0000000000000515 |url=}}</ref>

Revision as of 18:16, 23 January 2019


Epidemiology and Demographics

Risk factors

  • Prior head and neck irradiation is a risk factor for the development of Pleomorphic adenoma.[1]
  • Environmental factors
  • Occupations like working in rubber industry, nickel industry etc.[2][3]

Classification

  • Pleomorphic adenoma can be classified on the basis of the histological appearance i.e, epithelial and stromal changes into the following subgroups.[4]
    • Subgroup 1 (30,5%) is the classical pleomorphic adenoma with a stroma content of 30-50%
    • subgroup 2 (55%) has a stroma content of 80%
    • subgroup 3 (9%) has a poor stroma content of 20-30% or less and an epithelial differentiation similar to subgroup 1
    • subgroup 4 has also a poor stroma content (6%) with a relatively monomorphic epithelial structure.

Natural history, Complications and Prognosis

Natural history

References

  1. Gündüz AK, Yeşiltaş YS, Shields CL (September 2018). "Overview of benign and malignant lacrimal gland tumors". Curr Opin Ophthalmol. 29 (5): 458–468. doi:10.1097/ICU.0000000000000515. PMID 30028745.
  2. Swanson GM, Burns PB (August 1997). "Cancers of the salivary gland: workplace risks among women and men". Ann Epidemiol. 7 (6): 369–74. PMID 9279445.
  3. Horn-Ross PL, Ljung BM, Morrow M (July 1997). "Environmental factors and the risk of salivary gland cancer". Epidemiology. 8 (4): 414–9. PMID 9209856.
  4. Seifert G, Langrock I, Donath K (December 1976). "[A pathological classification of pleomorphic adenoma of the salivary glands (author's transl)]". HNO (in German). 24 (12): 415–26. PMID 1002574.