Hyperostosis is an excessive growth of bone. It may lead to exostosis.
see also Diffuse idiopathic skeletal hyperostosis.
The invasion of bone responsible for hyperostosis is a typical phenomenon associated with en plaque meningiomas. Although the sphenoid wing and spheno-orbital region are most frequently affected, petrosal involvement is rare and its surgical treatment difficult. Hyperostosis is caused by bone invasion, is responsible for the clinical signs, and prompts the surgeon to use an à la carte drilling that has to be evaluated preoperatively and carried out depending on tumor extension and the treatment goals.