Neonate With a Swollen Thigh Almaz Dessie, MD, Erika Constantine, MD  Annals of Emergency Medicine  Volume 68, Issue 5, Pages e87-e88 (November 2016) DOI: 10.1016/j.annemergmed.2016.05.001 Copyright © 2016 American College of Emergency Physicians Terms and Conditions

Figure 1 Left: Ultrasonographic transverse image showing diffuse soft tissue edema (short arrow) and irregular, thickened cortical surface of the distal femur (long arrow). Right: Comparison image of normal femur and soft tissues. Annals of Emergency Medicine 2016 68, e87-e88DOI: (10.1016/j.annemergmed.2016.05.001) Copyright © 2016 American College of Emergency Physicians Terms and Conditions

Figure 2 Ultrasonographic transverse image showing a 1×1-cm subperiosteal fluid collection (long arrow) with disruption of the overlying cortex (short arrow). Adjacent irregular, thickened, but intact bony cortex (ˆ). Annals of Emergency Medicine 2016 68, e87-e88DOI: (10.1016/j.annemergmed.2016.05.001) Copyright © 2016 American College of Emergency Physicians Terms and Conditions

Figure 3 MRI showing 1-cm intraosseous fluid collection in the distal femoral metaphysis (long arrow), extending into the epiphysis and knee joint (short arrow). Annals of Emergency Medicine 2016 68, e87-e88DOI: (10.1016/j.annemergmed.2016.05.001) Copyright © 2016 American College of Emergency Physicians Terms and Conditions