Most common Posterior fossa Brain tumor in children is
(B) Pilocytic astrocytoma# BRAIN TUMOURS IN CHILDREN# Cystic Cerebellar astrocytoma:> These comprises about 33% of all posterior fossa tumors in children.> Represents 25% of all pediatric tumors. Presentation is 9 years in average. Typically, presents as a laterally located cyst with a well-defined solid component. Tumor may be cystic or solid and located medially in Vermis or laterally in Cerebellar hemisphere. PILOCYTIC ASTROCYTOMA IN POSTERIOR FOSSATumorRelative Incidence (%)PresentationDiagnosisPrognosisMedulloblastoma35-402-3 months of headaches, vomiting, tunical ataxiaHeterogeneous or homogeneously enhancing fourth ventricular mass; may be disseminated65-85% survival; dependent on stage/ type; poorer (20-70%) in infantsCerebellar astrocytoma35-403-6 months of limb ataxia; secondary headaches, vomitingCerebellar hemisphere mass, usually with cystic and solid (mural nodule) components90-100% survival in total resected pilocytic typeBrain stem glioma10-151-4 months of double vision, unsteadiness, weakness & other cranial nerve deficits, facial weakness, swallowing deficits, and other deficitsDiffusely expanded, minimally or partially enhancing mass in 80%; 20% more focal cervicomedullary lesion # Medulloblastoma: Initially arises in inferior medullary velum. It grows to fill 4th ventricle by infiltrating the surrounding structures. Earlier, it is thought to be raised from medulloblastoma cells, which do not exist. Better it to be included in the family of PNETs.# Hemangioblastoma accounts about 7-12% of all posterior fossa tumors. Hemangioblastomas occurs 70% in Cerebellum & are cystic in nature, and presenting at the age of 30-40 years, more common in males, and are associated with von Hippel-Lindau disease.
Medulloblastoma
Pilocytic astrocytoma
Hemangioblastoma
Occipital fossa tumor * NIMHANS Pattern Post MBBS 2017; NIMHANS DM Neurology 2012
Miscellaneous