title: Cerebral venous thrombosis and "Dense Triangle Sign" on unenhanced head computed tomographic scan.
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.
authors.affiliation: Department of Emergency Medicine and Critical Care Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan. Electronic address: sonopy77@gmail.com.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Sonoo
authors.affiliation: Department of Emergency Medicine and Critical Care Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan.
authors.forename: Masataka
authors.initials: M
authors.lastname: Gunshin
authors.affiliation: International Research Center for Medical Education, The University of Tokyo, Tokyo 113-8655, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Son
authors.affiliation: Department of Emergency Medicine and Critical Care Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Nakajima
authors.affiliation: International Research Center for Medical Education, The University of Tokyo, Tokyo 113-8655, Japan.
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Kitamura
authors.affiliation: Department of Emergency Medicine and Critical Care Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo, 113-8655, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Yahagi
authors.affiliation: Department of Internal Medicine, Medical University of South Carolina, Charleston, SC, USA.
authors.forename: Jeffrey G
authors.initials: JG
authors.lastname: Wong
mesh_terms: D001921:Brain / Q000000981:diagnostic imaging; D006261:Headache / Q000209:etiology; D006801:Humans; D020767:Intracranial Thrombosis / Q000150:complications / Q000000981:diagnostic imaging*; D008297:Male; D059906:Neuroimaging; D014057:Tomography, X-Ray Computed; D055815:Young Adult