A tumor that is attached to the dura is most likely to be a meningioma.
This type of tumor arises from the arachnoid cap cells or the meningothelial cells
Deletion of region 12 on chromosome 22 is the most common cytogenetic abnormality of meningiomas.
Meningiomas are found to express progesterone receptors and that why theire size increases during pregnancy.
Meningioma contain calcified bodies called psammoma bodies. This is an example of dystrophic calcification.