title: Deep Vein Thrombosis Presenting on Pulmonary Ventilation and Perfusion Scintigraphy.
abstract: A 52-year-old woman presenting with dyspnea was referred for a ventilation and perfusion scan (VQ). VQ images (with Tc-DTPA [diethylene triamine pentaacetic acid aerosol] and Tc-MAA [macroaggregated albumin]) initially appeared normal; however, count rates on perfusion images were similar to ventilation images, implying little Tc-MAA had reached the lungs. Spot images of the injected extremity demonstrated focal Tc-MAA accumulation worrisome for a venous thrombus, subsequently confirmed by Doppler ultrasound. Careful attention to relative radiotracer count rates on VQ scans is crucial to ensure diagnostic utility. In addition, abnormal low perfusion radiotracer counts may unveil other pathology with important clinical implications.
authors.affiliation: From the *Department of Radiology, University of Washington, Seattle, WA; and †Department of Radiology, University of New Mexico, Albuquerque, NM.
authors.forename: Malak
authors.initials: M
authors.lastname: Itani
authors.forename: Joanna
authors.initials: J
authors.lastname: Fair
authors.forename: Zachary
authors.initials: Z
authors.lastname: Hillman
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Behnia
authors.forename: Saeed
authors.initials: S
authors.lastname: Elojeimy
mesh_terms: D005260:Female; D006801:Humans; D008875:Middle Aged; D055420:Perfusion Imaging; D012123:Pulmonary Ventilation; D016284:Technetium Tc 99m Pentetate; D020246:Venous Thrombosis / Q000000981:diagnostic imaging* / Q000503:physiopathology*
chemical_list: D016284:Technetium Tc 99m Pentetate