Figure 2

(A) Individual average spectra and standard deviation of meningioma subtypes and of dura mater. Based on 47 measuring points of fibrous meningioma (MGM_fibr, dark-blue), 110 of meningothelial meningioma (MGM_men, orange), 159 of transitional meningioma (MGM_tra, yellow), 4 of secretory meningioma (MGM_sec, light blue), 56 of atypical meningioma (MGM_aty, purple), 25 of NOS-meningioma (MGM_NOS, green) and 117 of dura mater (Dura, scarlet). The spectra were z-score normalized. (B) to (D): Zoomed-in subintervals with focus on the spectral differences between the different meningioma subtypes and dura mater. (B) Subintervals from 830 to 1020 cm⁻¹, (C) from 1200 to 1750 cm⁻¹, (D) from 2820 to 2960 cm⁻¹. The arrows in (A) to (D) represent the distinctive peaks between meningioma and dura mater, partially in line with the collagen spectrum³⁸.