A 13-month-old boy was brought to the emergency department by his parents for bilateral eyelid ecchymosis and edema for 1 month, as well as a mass on the right temporal area that was persistent for the past month and a half. He had hit the right side of his head on a table 1 month before symptoms developed, but had no other recent trauma. What would you do next?

中文翻译：

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13 个月大的双侧上眼睑瘀斑和水肿

男13个月，因双侧眼睑瘀斑水肿1个月，右侧颞部肿块持续1个半月，被父母带至急诊。症状出现前 1 个月，他的头部右侧撞在桌子上，但近期没有其他外伤。你接下来会做什么？