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Related Experiment Videos

Physiologic mechanisms underlying the delayed delta sign.

J L Ulmer1, A D Elster

  • 1Department of Radiology, Bowman Gray School of Medicine, Winston-Salem, NC 27103.

AJNR. American Journal of Neuroradiology
|July 1, 1991
PubMed
Summary
This summary is machine-generated.

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A new "delayed delta sign" on CT scans can mimic a sign of sagittal sinus thrombosis. This finding in delayed scans may lead to misdiagnosis if only postcontrast images are reviewed.

Area of Science:

  • Radiology
  • Neuroradiology
  • Medical Imaging

Background:

  • The negative delta sign on contrast-enhanced CT is a key indicator of superior sagittal sinus thrombosis.
  • Accurate diagnosis of sinus thrombosis is critical for timely patient management.

Purpose of the Study:

  • To describe a novel imaging finding, the
  • delayed delta sign
  • on delayed cranial CT scans.
  • To differentiate this sign from the classic negative delta sign associated with superior sagittal sinus thrombosis.

Main Methods:

  • Retrospective review of 50 patients undergoing cranial CT scans with delayed imaging (interval > 30 min post-contrast).
  • Analysis of imaging findings, specifically the presence and appearance of the delta sign.

Related Experiment Videos

  • Comparison of delayed scan findings with classic negative delta sign.

    • Main Results:

    • A visually similar sign, termed the "delayed delta sign", was observed in 5 (10%) of patients.
    • This sign was seen on delayed CT scans performed more than 30 minutes after contrast injection.
    • The delayed delta sign can closely mimic the classic negative delta sign.

    Conclusions:

    • The delayed delta sign is a potential imaging pitfall that can be mistaken for superior sagittal sinus thrombosis.
    • Awareness of this sign is crucial to avoid misdiagnosis, especially when relying solely on postcontrast images.
    • Understanding the underlying physiological mechanisms of the delayed delta sign is important for accurate interpretation.