Intermediate probability V/Q scan Intermediate probability V/Q scan. (A) Ventilation images demonstrate no focal defects. (B) Perfusion images demonstrate a segmental defect involving the anterior basal segment of the right lower lobe (white arrows), giving an intermediate probability for pulmonary embolism. CT angiogram performed 5 days later did not demonstrate any pulmonary emboli, although the patient received anticoagulation in the interim, and it is conceivable that any potential thrombus may have resolved. Source: Cardiothoracic Imaging, 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_ch04_fig-c6-07.png&sec=95876586&BookID=1562&ChapterSecID=95876454&imagename= Accessed: December 20, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved