Thirty-six patients with a solitary brain tumor (20 gliomas, 16 metastases) underwent conventional, contrast material–enhanced perfusion-weighted, and proton spectroscopic magnetic resonance imaging before surgical resection or stereotactic biopsy at our neurology and neurosurgery specialized center from April 2024 to December 2024. All patients had a previously untreated solitary enhancing brain tumor and peritumoral non-enhancing lesion and had undergone conventional brain MRI and DWI before surgical intervention. Patients with infratentorial lesion were excluded, as were those with a previous history of surgery or whose peritumoral T2 high-signal lesion was not large enough to evaluate on T2-weighted imaging.The peritumoral region was defined as the area in the white matter immediately adjacent to the enhancing (hyperintense on T2-weighted images, but not enhancing on postcontrast T1-weighted images) portion of the tumo.To ascertain whether there were differences in the morphologic parameters of enhancing tumors, we analysed their shape, margins, and enhancement patterns on postcontrast T1-weighted images.  Furthermore, the aim was to detect peritumoral neoplastic cell infiltration by visual assessment of T2-weighted and diffusion-weighted images, including DWI, ADC maps. Relative cerebral blood volumes in these regions were calculated from perfusion-weighted MR data. Spectra from the enhancing tumor, the peritumoral region, and normal brain were obtained from the two-dimensional spectroscopic MR acquisition.