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Related Experiment Videos

'Reverse crescent pattern' on SPECT brain perfusion scan in chronic subdural hematoma.

H Toyama1, M Ichise, B I Schacter

  • 1Department of Radiology, Mount Sinai Hospital, University of Toronto, Ontario, Canada.

Clinical Nuclear Medicine
|June 1, 1992
PubMed
Summary
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A SPECT brain perfusion scan revealed a "reverse crescent pattern" in a dementia patient. This pattern, along with specific perfusion changes, may indicate chronic subdural hematoma.

Area of Science:

  • Neurology
  • Radiology
  • Nuclear Medicine

Background:

  • Dementia diagnosis can be challenging, requiring advanced neuroimaging techniques.
  • Chronic subdural hematomas can present with non-specific neurological symptoms, mimicking dementia.

Observation:

  • A patient with dementia symptoms underwent a SPECT brain perfusion scan.
  • The scan demonstrated a distinct "reverse crescent pattern" with medial displacement of the left cerebral hemisphere.
  • Mildly decreased cortical perfusion was noted in the affected hemisphere, without crossed cerebellar diaschisis.

Findings:

  • X-ray computed tomography (CT) identified a unilateral chronic subdural hematoma as the underlying cause.
  • The subdural hematoma exerted a significant mass effect on the brain.

Related Experiment Videos

  • The SPECT findings of a "reverse crescent pattern" and absence of crossed cerebellar diaschisis were associated with the chronic subdural hematoma.

    • Implications:

    • The "reverse crescent pattern" on SPECT brain perfusion scans, particularly in patients with dementia symptoms, can be a valuable indicator for diagnosing chronic subdural hematoma.
    • This imaging finding may help differentiate subdural hematoma from other causes of dementia, potentially leading to earlier and more appropriate treatment.
    • Further research could validate the sensitivity and specificity of this SPECT pattern in diagnosing chronic subdural hematoma in the context of dementia.