Posterior Fossa Tumour

Posterior fossa tumour has a very different differential in an adult as opposed to a child

Adult

• Cerebella meastases (most common) 
• especially lung cancer and breast cancer
• also melanoma, thyroid malignancies and renal cell cancer
• Haemangioblastoma: most common primary brain tumour
• astrocytomas and medulloblastomas are rare in the posterior fossa of adults (< 1% all tumours) 

Child 

• posterior fossa astrocytoma
• pilocytic astrocytoma : most common 
• brainstem glioma 
• Medulloblastoma 
• Ependymoma
• Atypical teratoid/rhabdoit tumour
• Haemangioblastoma 
• Teratoma 

** Overall 50-55% of all brain tumours in children are found in the posterior fossa**

Reference:

• http://radiopaedia.org/articles/posterior-fossa-tumours