A Study to Test a New Fluid to Improve the Quality of Images Obtained by Using Sound Waves (Ultrasound) During Surgery

Key Inclusion Criteria: * A diffuse malignant glial tumour (high grade (grade III and IV) or low grade (grade I-II)) is suspected from the diagnostic MRI scan * Pre- or peri-procedural confirmed histopathology of glioma * ≥18 years of age * Karnofsky performance status ≥ 70 * Life expectancy of more than 30 days at the time of procedure * Negative pregnancy test for female subjects of childbearing potential Key Exclusion Criteria: * Not able to give consent (e.g., severe cognitive impairment) * History of brain radiation therapy * Recent meningitis (within 6 months prior to screening visit) * Other active infection (within 30 days prior to screening visit) * Immuno-incompetent patient (e.g., failing immune system due to AIDS) * Patients taking immune-suppressive medication * Intended biopsy only (meaning cases not suitable for resection) * Known hypersensitivity to egg protein * Known hypersensitivity to soybean or peanut protein * Known Hypersensitivity to glycerol * Pregnant or lactating females or females who intend to become pregnant during the time of the study