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Angiology
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"Pseudo-Delta Sign" on Computed Tomography in an Extremely Acute Stage of Superior Sagittal Sinus Thrombosis—A Case Report

Shuzo Shintani

Department of Internal Medicine, Tokyo Metropolitan Ebara Hospital, Tokyo, Japan

Hiroshi Murase

Department of Internal Medicine, Tokyo Metropolitan Ebara Hospital, Tokyo, Japan

Hidekazu Ota

Second Department of Pathology, Showa University School of Medicine, Tokyo, Japan

Hiroshi Tsukagoshi

Department of Neurology, Tokyo Medical and Dental University, Tokyo, Japan

Zenji Shiozawa

Third Department of Internal Medicine, Neurology, Yamanashi Medical University, Yamanashi, Japan

A case of superior sagittal sinus (SSS) thrombosis with a "pseudo-delta sign" on computed tomography (CT) is reported. The so-called "empty delta sign," which usually appears following contrast enhancement, is reliable in the CT diagnosis of SSS thrombosis but may not appear, it is said, in the extremely acute stage. In this patient, however, the "empty delta sign" appeared with precontrast CT scans and disappeared with postcontrast CT scans, "pseudo-delta sign," in the extremely acute stage of SSS thrombosis. On the precontrast CT, blood surrounding the sagittal sinus outlined it; when contrast was given, it became dense with blood.

Angiology, Vol. 41, No. 5, 417-420 (1990)
DOI: 10.1177/000331979004100511
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