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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> | ||
==Classification== | ==Classification== | ||
* | *Pleomorphic adenoma can be classified on the basis of the histological appearance i.e, epithelial and stromal changes into the following subgroups.<ref name="pmid1002574">{{cite journal |vauthors=Seifert G, Langrock I, Donath K |title=[A pathological classification of pleomorphic adenoma of the salivary glands (author's transl)] |language=German |journal=HNO |volume=24 |issue=12 |pages=415–26 |date=December 1976 |pmid=1002574 |doi= |url=}}</ref> | ||
**Subgroup 1 (30,5%) is the classical pleomorphic adenoma with a stroma content of 30-50% | **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 2 (55%) has a stroma content of 80% | ||
Revision as of 14:54, 9 January 2019
Epidemiology and Demographics
Incidence
- The annual incidence of Pleomorphic adenoma is approximately 2-3.5 cases per 100,000 population.[1]
- It accounts for 45-75% of all salivary gland neoplasms.
- Pleomorphic adenoma distribution among the salivary glands is as follows[2]:
- Parotid gland: 84%
- Submandibular gland: 8%
- Minor salivary glands: 6.5%
Age
- People of all age groups may develop Pleomorphic adenoma.[1]
- The incidence of Pleomorphic adenoma increases with age; the average age at diagnosis is 43-46 years.
Race
There is no racial predilection to Pleomorphic adenoma.
Gender
- Females are predominantly affected by Pleomorphic adenoma than males. The female to male ratio is approximately (2:1)
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.[3]
Risk factors
Prior head and neck irradiation is a risk factor for the development of Pleomorphic adenoma.[4]
Classification
- Pleomorphic adenoma can be classified on the basis of the histological appearance i.e, epithelial and stromal changes into the following subgroups.[5]
- 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.
References
- ↑ 1.0 1.1 Pinkston JA, Cole P (June 1999). "Incidence rates of salivary gland tumors: results from a population-based study". Otolaryngol Head Neck Surg. 120 (6): 834–40. doi:10.1016/S0194-5998(99)70323-2.
- ↑ Zhan KY, Khaja SF, Flack AB, Day TA (April 2016). "Benign Parotid Tumors". Otolaryngol. Clin. North Am. 49 (2): 327–42. doi:10.1016/j.otc.2015.10.005. PMID 27040584.
- ↑ Martinelli M, Martini F, Rinaldi E, Caramanico L, Magri E, Grandi E, Carinci F, Pastore A, Tognon M (October 2002). "Simian virus 40 sequences and expression of the viral large T antigen oncoprotein in human pleomorphic adenomas of parotid glands". Am. J. Pathol. 161 (4): 1127–33. doi:10.1016/S0002-9440(10)64389-1. PMC 1867276. PMID 12368186.
- ↑ 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.
- ↑ 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.