PGR and Atypical Meningioma: 81.1% of meningothelial meningiomas expressed progesterone receptors (95% CI: 75.5–86.7) compared to 75.8% of transitional meningiomas (95% CI: 68.5–83.1), 58.1% of fibroblastic meningiomas (95% CI: 45.8–70.4), 81.4% of psammomatous meningiomas (95% CI: 68–94.8), 87.5% of secretory meningiomas (95% CI: 63–100), 50.5% of atypical meningiomas (95% CI: 31.8–69.2), and 38.5% of anaplastic meningiomas (95% CI: 19.8–57.2).