“…However, the incidence is recently increasing as a consequence of widespread routine examination of the brain with high-resolution ultrasonography for neonates. There have also been many previous reports for macrocrania, or focal enlargement of skull, in patients with arachnoid cysts [6,7,17,19]. Arachnoid cysts of the middle cranial fossa is the most frequent form, and usually present as ballooning of the temporal skull, but occasionally, the condition paradoxically produces a small cranium [3,18].…”