Turkish Neurosurgery
Mount Meningioma with tumor cap
Nishant Goyal 1, Guru Satyarthee1, Aanchal Kakkar2, Vaishali Suri2, Sarat Chandra1, Bhawani Sharma1
1All India Institute of Medical Sciences, Department of Neurosurgery, New Delhi,
2All India Institute of Medical Sciences, Department of Neuropathology, New Delhi,
DOI: 10.5137/1019-5149.JTN.7420-12.0

The association between meningioma and hyperostosis of adjacent calvarium is well established. However, the cause of hyperostosis in meningioma has long been a matter of debate. There are various hypotheses which aim at explaining this phenomenon including preceding trauma, irritation of the bone by the tumor without bony invasion, stimulation of osteoblasts in normal bone by factors secreted by tumor cells, production of the bone by the tumor itself and vascular disturbances caused by the tumor. The authors wish to report a case of parasagittal meningioma in which the bone overlying the meningioma was so hyperostotic that it appeared to look like a ‘mountain’. In addition, the tumor appeared to invade through the bone to form a ‘tumor cap’ over the hyperostotic bone.

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