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Diagnostic Tests: Skull X-Rays
Abnormalities Detected by Skull X-Rays
Skull X-rays are plain radiographic studies that evaluate the bony structures of the skull. They are capable of detecting:
These findings relate strictly to abnormalities of the skull bones, not the brain itself.
What Skull X-Rays Do Not Detect
Skull X-rays provide no information about intracranial structures. Specifically, they cannot detect:
Because they do not visualize the brain or soft tissues, skull X-rays are not useful for assessing neurologic injury.
Use of Skull X-Rays After Head Trauma
In patients with head trauma, skull X-rays are never the correct diagnostic test. Even if skull fractures are suspected, imaging that visualizes the brain is required. The appropriate test in head trauma is a non-contrast CT scan of the head, which can detect both fractures and intracranial bleeding.
Exam pearl:
If a question involves head injury or trauma, skull X-rays may appear as an answer choice, but they should not be selected.
Abnormalities Detected by Skull X-Rays
Skull X-rays are plain radiographic studies that evaluate the bony structures of the skull. They are capable of detecting:
- Skull fractures
- Lytic lesions (such as those caused by metastatic cancer)
- Blastic lesions (seen in conditions like prostate cancer metastases)
- Bone disorders, including Paget’s disease
These findings relate strictly to abnormalities of the skull bones, not the brain itself.
What Skull X-Rays Do Not Detect
Skull X-rays provide no information about intracranial structures. Specifically, they cannot detect:
- Intracranial hemorrhage (epidural, subdural, subarachnoid, or intraparenchymal)
- Brain contusions
- Cerebral edema
- Mass effect or midline shift
Because they do not visualize the brain or soft tissues, skull X-rays are not useful for assessing neurologic injury.
Use of Skull X-Rays After Head Trauma
In patients with head trauma, skull X-rays are never the correct diagnostic test. Even if skull fractures are suspected, imaging that visualizes the brain is required. The appropriate test in head trauma is a non-contrast CT scan of the head, which can detect both fractures and intracranial bleeding.
Exam pearl:
If a question involves head injury or trauma, skull X-rays may appear as an answer choice, but they should not be selected.
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