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| ==Parathyroid carcinoma== | | ==Parathyroid carcinoma== |
| ===General===
| | {{Main|Parathyroid carcinoma}} |
| *Extremely rare.
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| ===Microscopic===
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| Features:<ref>{{Ref PBoD8|1128}}</ref>
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| *Histologically normal parathyroid cells.
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| **Cytologic features '''not''' reliable for diagnosis.
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| *Fibrous capsule.
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| *Invasion of surrounding tissue - '''key feature'''.
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| *+/-[[Metastasis]] - '''diagnostic feature'''.
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| Note:
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| *Diagnosis of ''parathyroid carcinoma'' is like that of ''malignant [[pheochromocytoma]]'' - cytology useless, tissue invasion and metastases are the key features.
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| Image:
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| *[http://emedicine.medscape.com/article/280908-overview Parathyroid carcinoma (medscape.com)].
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| ===IHC===
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| *Ki-67 >6% of cells positive - supports diagnosis.<ref name=pmid7860042>{{Cite journal | last1 = Abbona | first1 = GC. | last2 = Papotti | first2 = M. | last3 = Gasparri | first3 = G. | last4 = Bussolati | first4 = G. | title = Proliferative activity in parathyroid tumors as detected by Ki-67 immunostaining. | journal = Hum Pathol | volume = 26 | issue = 2 | pages = 135-8 | month = Feb | year = 1995 | doi = | PMID = 7860042 }}</ref>
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| **Parathyroid adenomas and hyperplasias ~ 3%.
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| =See also= | | =See also= |