In evaluating a closed skull fracture, which diagnostic test is commonly used?

• A. EEG
• B. Lumbar puncture
• C. CT scan
• D. Abdominal ultrasound

Answer: (C)

Imaging that rapidly reveals bone injury and any related brain damage is essential when a skull fracture is suspected. A CT scan fits this need best because it provides quick, detailed pictures of the skull and detects fractures as well as acute intracranial bleeding or mass effects. EEG measures brain electrical activity, not bone injury, so it doesn’t help diagnose a fracture. Lumbar puncture involves sampling CSF and is not used to assess skull fractures; it can be dangerous if a fracture is present due to the risk of brain herniation. Abdominal ultrasound has no relevance to head injuries. So, a CT scan is the most appropriate and commonly used test.