(A) Perfusion image of the lungs obtained in the anterior view demonstrates large segmental defects bilaterally (arrows), which are not matched by similar ventilation abnormalities (B). This pattern on a ventilation-perfusion scan carries a high probability for pulmonary thromboembolism. Source: Introduction to Nuclear Medicine, Introduction to Diagnostic Radiology Citation: Elsayes KM, Oldham SA. Introduction to Diagnostic Radiology; 2015 Available at: https://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/Books/1562/Elsayes_Ch02_Fig-02-27.png&sec=95875607&BookID=1562&ChapterSecID=95875470&imagename= Accessed: October 06, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved