![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Psammoma.jpg/300px-Psammoma.jpg)
Round collection of calcium.
- thought to arise from infarction and calcification of intralymphatic tumor thrombi
Commonly seen with:
- papillary thyroid cancer
- papillary RCC
- serous papillary ovarian adenoca
- endometrial adenoca
- meningioma
- mesothelioma
- prolactinoma
- endosalpingiosis
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