8-year-old male with macrocephaly and a left arachnoid cyst. Evaluate progression of the cyst. Left middle intracranial fossa cyst without significant change in size given the differences in technique. No evidence of hydrocephalus or midline shift. No evidence of intracranial hemorrhage, edema or solid mass. The ventricles and basal cisterns are unremarkable in size and configuration.Intracranial mild scalloping and thinning of the calvarial bone is nonspecific and may be secondary to a history of chronic increased intracranial pressure or a normal variant. The visualized paranasal sinuses and mastoid air cells are normally pneumatized.
Grossly stable left middle cranial fossa arachnoid cyst.