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| ==Epidemiology and Demographics== | | ==Epidemiology and Demographics== |
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| ==Classification==
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| *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>
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| **Subgroup 1 (30,5%) is the classical pleomorphic adenoma with a stroma content of 30-50%
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| **subgroup 2 (55%) has a stroma content of 80%
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| **subgroup 3 (9%) has a poor stroma content of 20-30% or less and an epithelial differentiation similar to subgroup 1
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| **subgroup 4 has also a poor stroma content (6%) with a relatively monomorphic epithelial structure.
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| ==Natural history, Complications and Prognosis== | | ==Natural history, Complications and Prognosis== |
| ===Natural history=== | | ===Natural history=== |