Although it is true that posterior fossa tumours are much more common in children than in adults the distribution does vary with age:
0 to 3 years of age: supratentorial > infratentorial
4 to 10 years of age: infratentorial > supratentorial
10 to early adult hood: infratentorial = supratentorial
adults: supratentorial > infratentorial
Overall 50-55% of all brain tumours in children are found in the posterior fossa.
Cerebellar metastases (most common)
Cerebellar astrocytomas and medulloblastomas are rare in the posterior fossa of adults (<1% all tumours) An important space occupying lesion (the most common in fact) to remember is that of a stroke, which when subacute can mimic a tumour.
Quarante et al report 2 new pediatric cases of posterior reversible encephalopathy syndrome (PRES) that developed after surgical resection of a posterior fossa tumor. Appropriate management includes supportive measures, antihypertensive agents, and antiepileptic drugs, if needed. Full recovery is the most likely outcome in line with previous articles 1).