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Am J Emerg Med. 2014 Feb;32(2):192.e3-4. doi: 10.1016/j.ajem.2013.08.055. Epub 2013 Oct 16.

Cerebral venous thrombosis and "Dense Triangle Sign" on unenhanced head computed tomographic scan.

Author information

  • 1Department of Emergency Medicine and Critical Care Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan. Electronic address: sonopy77@gmail.com.
  • 2Department of Emergency Medicine and Critical Care Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan.
  • 3International Research Center for Medical Education, The University of Tokyo, Tokyo 113-8655, Japan.
  • 4Department of Emergency Medicine and Critical Care Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo, 113-8655, Japan.
  • 5Department of Internal Medicine, Medical University of South Carolina, Charleston, SC, USA.

Abstract

This case report describes a 21-year-old man with headache who was ultimately diagnosed as having cerebral venous thrombosis(CVT), a rare cause of headache in the emergency department that is sometimes lethal. However, correct diagnosis of CVT is often quite difficult because of a lack of findings in imaging studies. Unenhanced head computed tomography was completely normal in up to 39% of patients diagnosed as having CVT, but a subtle sign known as 'Dense Triangle Sign' was found in this case. This finding disappeared after anticoagulation therapy. Emergency physicians must know about this finding to diagnose this rare condition correctly.

PMID:
24139952
[PubMed - indexed for MEDLINE]
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