A case report on a late diagnosis of pilocytic astrocytoma in a Dandy-Walker complex.

Dandy-Walker malformation (DWM) and pilocytic astrocytoma are entities that manifest themselves at an early age. DWM is a cerebella type associated with several anatomical changes. Very few cases of concomitant occurrence of DWM and pilocytic astrocytoma have been reported on the literature. Male 20 years old, clinical history of 6 months of evolution with nausea, dizziness, headache, photophobia, phonofobia, vomiting, walking laterality, diplopia, tonic-clonic seizures, nystagmus, dysmetria, and dysdiadochokinesia. Cranial tomography was performed, reporting hydrocephaly data with significant dilation of the IV ventricle and the presence of a tumor lesion in the posterior fossa of the right cerebellar hemisphere. Pediatric tumors that manifest in adulthood are rare, with signs such as intracranial hypertension and compress the cranial nerves. The prognosis will be determined by the accompanying abnormalities as well as the effectiveness of the appropriate treatment.