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The copper-beaten skull (also known as beaten silver or copper-hammered skull) refers to a prominent convolutional (gyral) impression of the cerebral gyri on the inner table of the skull, seen on skull radiographs or CT. These impressions resemble beaten metal—hence the name.

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Radiologic Appearance

Seen as multiple linear, radiolucent markings on the inner table of the calvarium

• Best appreciated on:

  • Skull radiographs (lateral view)
  • CT (bone window)

• Typically involves:

  • Frontal and parietal bones most commonly
  • Inner table of skull vault
  • Symmetric, well-circumscribed impressions

![(a) X-ray of the skull in a 3 year old male child presenting with a history of seizure. The skull resembles a beaten piece of metal with its waxing and waning levels of opacities. Note the distinctly small size of the cranial vault, consistent with microcephaly. There is a complete absence of any suture lines as well, confirming the diagnosis of Craniosynostosis. (b) Note the bevelling of the inner table of the cranium (arrows). This is caused by a growing brain against a rigid cranial vault secondary to the premature closure of all the major suture lines.

Case courtesy Dr Nabarun Das, MD // 2025](attachment:24f0b59f-1499-42c9-bd0b-6759917bfef6:CBS.jpg)

(a) X-ray of the skull in a 3 year old male child presenting with a history of seizure. The skull resembles a beaten piece of metal with its waxing and waning levels of opacities. Note the distinctly small size of the cranial vault, consistent with microcephaly. There is a complete absence of any suture lines as well, confirming the diagnosis of Craniosynostosis. (b) Note the bevelling of the inner table of the cranium (arrows). This is caused by a growing brain against a rigid cranial vault secondary to the premature closure of all the major suture lines.

Case courtesy Dr Nabarun Das, MD // 2025

Pathophysiology

• Reflects increased intracranial pressure (ICP), which causes the expanding brain to press against the developing skull, accentuating gyral markings.
• These markings are normal in children, especially aged 4–10 years, due to ongoing skull remodeling.
• Becomes pathologic when:
  • Excessive or widespread
  • Associated with other signs of raised ICP or craniosynostosis

Etiology

Clinical relevance

• Isolated copper-beaten appearance in a neurologically normal child is usually benign
• When accompanied by accelerated head growth, neurological symptoms or suture fusion on imaging (Non-syndromic craniosynostosis) → suggests raised ICP and warrants further workup

Case report:

Differentials