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Mature teratoma of the vermis is a rare entity in neurosurgical adulthood pathology. We present the case of a 65 years old patient, admited as an emergency for intense headache (VAS 8/10), nausea, vomiting, gait ataxia, orizontal nistagmus, dismetria, disdiadocokinezia, predominant on the left side, long tracts signs, predominant on the left side. Native and contrast CT and MRI scan of the head revealed a tumoral lesion, in the vermian, paravermian and in the fourth ventricle, with the aspect of a teratoma with intratumoral subacute haemorrhage including a giant lesion 5,5/5/4,5 cm, compressive on mesencephalon, and with suprajacent acute internal hidrocephalus. Emergency neurosurgery was performed (occipital infratentorial craniectomy, microneurosurgical total tumoral resection and haematoma evacuation). Postoperative, the patient recovered progressivelly , subtotal neo and arhicerebellar symptoms. The motor long tract signs recovered slower and persisted incomplete

Giant posterior fossa mature teratoma with adjacent subacute haematoma, compressive on the brainstem, with acute hydrocephalus. Case report