Progressive Foot Swelling and Pain R. Jason Thurman, MD, Ashley R. Brown, MD, Robinson M. Ferre, MD  Annals of Emergency Medicine  Volume 59, Issue 6, (June 2012) DOI: 10.1016/j.annemergmed.2011.10.025 Copyright © 2012 American College of Emergency Physicians Terms and Conditions

Figure 1 Lateral view of the patient's right foot mass. Annals of Emergency Medicine 2012 59, DOI: (10.1016/j.annemergmed.2011.10.025) Copyright © 2012 American College of Emergency Physicians Terms and Conditions

Figure 2 Color Doppler ultrasonographic evaluation of the dorsal foot lesion. Annals of Emergency Medicine 2012 59, DOI: (10.1016/j.annemergmed.2011.10.025) Copyright © 2012 American College of Emergency Physicians Terms and Conditions

Figure 3 Swirling of blood flow within the foot lesion, demonstrating the sonographic ”yin-yang sign.” Used with permission of R. Jason Thurman, MD, Department of Emergency Medicine, Vanderbilt University Medical Center, Nashville, TN. Annals of Emergency Medicine 2012 59, DOI: (10.1016/j.annemergmed.2011.10.025) Copyright © 2012 American College of Emergency Physicians Terms and Conditions