Core curriculum illustration: cerebral venous thrombosis
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- Cite this article as:
- Zaidi, S.F., Nickels, D. & Linnau, K.F. Emerg Radiol (2014) 21: 83. doi:10.1007/s10140-013-1189-6
This is the fifth installment of a series that will highlight one case per publication issue from the bank of cases available online as part of the American Society of Emergency Radiology (ASER) educational resources. Our goal is to generate more interest in and use of our online materials. To view more cases online, please visit the ASER Core Curriculum and Recommendations for Study online at http://www.aseronline.org/curriculum/toc.htm.
A 27-year-old woman with history of sinus headaches developed severe headache and nausea 2 days prior to presentation. The headache was sharp, frontal in location, and radiating to the nose and eyes. Initially, she attributed the headache to her sinus disease, but after there was no improvement over 2 days, she presented to the emergency department. She has a past medical history of polycystic ovarian syndrome for which she takes oral contraceptive pills (OCPs).
There was no evidence of venous infarction concordant with the patient’s neurological exam, which was unremarkable. Anticoagulation therapy was started, and the patient did well.
The cause of venous sinus thrombosis was initially attributed to OCPs; however, a complete hypercoagulability workup later revealed a prothrombin gene mutation for which the patient was kept on lifelong low molecular weight heparin.
Cerebral venous thrombosis (CVT) is a potentially life-threatening, yet easily treatable, condition, if diagnosed in a timely manner. The biggest dilemma in diagnosing this condition is the fact that clinical presentation is nonspecific . Clinical presentation may range from headache, focal neurologic deficits, seizures, and altered consciousness  to obscuration of vision, nausea, vomiting, papilledema, cranial nerve palsies, and even coma .
The etiology of CVT is multifactorial . It may result from local alterations in cerebral venous blood flow due to skull trauma or intracranial/head and neck infections that may promote thrombosis. CVT can also occur due to systemic causes including hypercoagulable states and diseases .
Angiography remains the gold standard for imaging this condition  but may not be routinely available at many institutions. MRI and MRV are considered as the modality of choice for detecting CVT . Non-contrast head CT remains the first-line imaging modality for patients presenting to the ED with neurological symptoms .
This case demonstrates the findings of cerebral venous thrombosis on non-contrast head CT. Thrombus is visible on non-enhanced CT as a high-attenuation lesion in the venous sinus, producing a dense triangle/delta sign representing the intravascular acute blood clot . Our patient subsequently had a CT venogram (CTV) since the combination of CT and CTV is a rapid screening modality for an early diagnosis of CVT in the emergency setting . CTV with multi-planar reformats has a reported sensitivity of 95 % when compared with conventional angiography .
Detection of this disease on a non-contrast CT is very important for emergency radiologists in order to facilitate further imaging evaluation with a venogram to confirm the diagnosis. In our case, prompt diagnosis lead to early treatment, saving the patient from fatal complications like venous hemorrhagic infarction which may have resulted in permanent neurological damage.
Conflict of Interest
The authors declare that they have no conflict of interest.