Mid-sagittal US images in an 11-year-old boy with the wrist in (A) neutral position showing a bulging MC recess (measured from the surface of the capitate to the junction between hypoechoic and hyperechoic tissue, double arrow) and in (B) flexed position showing a reduced depth (stippled arrow). MC, midcarpal; US, ultrasound. Mid-sagittal US images in an 11-year-old boy with the wrist in (A) neutral position showing a bulging MC recess (measured from the surface of the capitate to the junction between hypoechoic and hyperechoic tissue, double arrow) and in (B) flexed position showing a reduced depth (stippled arrow). MC, midcarpal; US, ultrasound. Karen Rosendahl et al. RMD Open 2018;4:e000642 Copyright © BMJ Publishing Group & EULAR. All rights reserved.