Perivascular space imaging during therapy for medulloblastoma

Area of Science:

• Neuroimaging
• Pediatric Oncology
• Radiotherapy Research

Background:

• Perivascular spaces (PVS) are fluid-filled compartments around brain blood vessels.
• The effects of radiotherapy and chemotherapy on PVS in pediatric medulloblastoma (MB) are not well understood.

Purpose of the Study:

• To investigate the impact of radiotherapy and chemotherapy on PVS in pediatric MB patients.
• To analyze changes in PVS volume and ratio at four time points: baseline, post-radiotherapy, post-chemotherapy, and follow-up.

Main Methods:

• Utilized 778 MRI scans from 241 MB patients.
• Segmented PVS in white matter using Frangi filter on T1-weighted MPRAGE images (3T Siemens MRI).
• Analyzed PVS volume and ratio using full and paired statistical models.

Main Results:

• PVS volume and ratio increased after radiotherapy but decreased during chemotherapy.
• PVS levels rose again from chemotherapy completion to follow-up.
• Anesthesia and shunt procedures were associated with significantly altered PVS volumes.

Conclusions:

• Craniospinal irradiation elevates PVS in pediatric MB patients.
• Chemotherapy and time post-irradiation lead to a decrease in PVS.
• Anesthesia and shunt placement are factors influencing PVS measurements.