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Ossification of the Falx Cerebri

Summary

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  • Rare condition characterised by calcification or ossification of the falx cerebri
  • Typically asymptomatic and discovered incidentally on imaging
  • May be associated with underlying metabolic disorders or age-related changes

Pathophysiology

  • Exact mechanism unclear, but proposed theories include:
    • Dystrophic calcification due to chronic inflammation or microtrauma
    • Metaplastic bone formation in dural connective tissue
    • Abnormal calcium metabolism in some cases

Demographics

  • Prevalence increases with age, more common in elderly population
  • No significant gender predilection reported
  • Rare in children, but cases have been documented
  • Higher prevalence in certain ethnic groups (e.g., Japanese)

Diagnosis

  • Often an incidental finding on neuroimaging studies
  • Clinical presentation:
    • Usually asymptomatic
    • Rarely associated with headaches or seizures
  • Differential diagnosis:
    • Meningioma
    • Dural metastases
    • Intracranial calcifications of other aetiologies

Imaging

  • Computed Tomography (CT):
    • Linear or curvilinear hyperdense lesion along the falx cerebri
    • May appear as single or multiple foci of calcification
    • Hounsfield units similar to bone
  • Magnetic Resonance Imaging (MRI):
    • T1-weighted: Hypointense signal
    • T2-weighted: Hypointense signal
    • Susceptibility-weighted imaging (SWI): Marked hypointensity
  • Plain radiographs:
    • May be visible on lateral skull X-rays as linear calcification

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  • A 50-year-old patient presented with headache.
  • CT showed lobulated calcification of both sides of the falx.
  • The T1-hyperintensity and lack of enhancement was consistent with ossification of the falx (rather than a meningioma).

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  • Incidental finding of ossified falx cerebri with blooming on SWI and T1 shortening.

Treatment

  • No specific treatment required for asymptomatic cases
  • Management focuses on addressing any underlying metabolic disorders if present
  • In rare symptomatic cases:
    • Conservative management of headaches with analgesics
    • Anticonvulsants for seizure control if necessary
  • Surgical intervention generally not indicated unless complications arise

Differential diagnosis

Differential Diagnosis Differentiating Feature
Meningioma Ossification of the falx cerebri is typically linear and thin, while meningiomas are more nodular or mass-like
Calcified subdural haematoma Ossification of the falx is midline, while subdural haematomas are typically crescentic and follow the inner table of the skull
Dural metastases Metastases often have irregular borders and multiple lesions, while falx ossification is smooth and singular
Psammomatous meningioma Psammomatous meningiomas show punctate calcifications, while falx ossification is more continuous
Hyperostosis Hyperostosis affects the skull bones, while falx ossification is within the intracranial space
Calcified epidural haematoma Epidural haematomas are typically biconvex and do not cross suture lines, unlike falx ossification
Intracranial lipoma Lipomas have fat density on CT, while falx ossification shows bone density
Sturge-Weber syndrome Sturge-Weber calcifications are typically gyriform and cortical, not in the falx
Tuberous sclerosis Tuberous sclerosis calcifications are often subependymal, not in the falx
Physiological calcification Physiological calcifications are typically seen in the pineal gland or choroid plexus, not in the falx