“…Other factors that have been explored as possible risk factors for meningioma development are previous head trauma, previous breast cancer, and elevated estrogen levels. Although case studies and retrospective analysis studies have taken place, to date, there are no definitive data to support these theories (Custer, Koepsell, & Mueller, 2002;Haddad, Al-Mefty, & Abdulrauf, 2004;Phillips et al, 2002;Shaw, Kissun, Boyle, & Triantafyllou, 2004).…”