Venous malformation mimicking a posterior fossa tumor in a young child.

Symptomatic venous malformations are uncommon at any age. They are extremely rare in the first decade of life. We describe a 3.5-year-old child with a cerebellar venous malformation presenting with a subacute course mimicking the more common posterior fossa tumors. The child's symptoms were due to a posterior fossa hemorrhage; she subsequently did well. The clinical, CT, angiographic, and pathologic features are described. Venous malformations should be included in the differential diagnosis of young children with evidence of posterior fossa disease.