2026 Poster Presentations
P434: OCCIPITAL TRANSTENTORIAL RESECTION OF A MATURE TERATOMA IN THE PINEAL REGION
Justin Z Wang1; Vesna Malinova2; Ivan Radovanovic2; 1The University of Toronto; 2University Health Network
A 22-year-old presented with a large pineal region tumour. He presented to a peripheral hospital with obstructive hydrocephalus and an endoscopic third ventriculostomy was performed with a concomitant biopsy that was non-diagnostic. We took the patient to the operating room for definitive resection of this tumour through an occipital transtentorial approach. Intraoperatively, there were clearly two different morphologies to the tumour, which suggested a mixed cell type tumour. The final pathology was a mature teratoma.