Case report: Pseudoprogression mimicking neoplastic recurrence three months after completion of proton beam therapy for an IDH-mutant astrocytoma CNS WHO grade 3 - Heggebø, Liv Cathrine; Borgen, Ida Maria Henriksen; Blakstad, Hanne; Saxhaug, Cathrine; Rønning, Pål André; Niehusmann, Pitt Frederik; Werlenius, Katja; Blomstrand, Malin; Brandal, Petter (Frontiers in Oncology, 2025)