Posterior fossa vascular anomaly presenting as a vermis mass in a 4-year-old child: diagnostic and therapeutic considerations.

The computed tomographic (CT) scan has replaced angiography in the preoperative neurodiagnostic evaluation of the common pediatric posterior fossa tumors. This case report illustrates that rarely an atypical vascular anomaly may masquerade as a neoplasm and angiography must not be dismissed if the CT scan is any way atypical of the suspected neoplasm.