Sonographic Appearance of the Extensor Carpi Radialis Intermedius Tendon

Abstract

Figure 1. Transducer positioning for sonographic short-axis (SAX) view of the second dorsal compartment (CPT) with correlative sonographic and magnetic resonance imaging (MRI) images. (A) Transducer (black rectangle) and patient positioning for the sonographic SAX view of the second dorsal CPT. (B) Sonographic correlative image of the second dorsal CPT at the level of the proximal intersection of the first dorsal CPT over the second dorsal CPT. The extensor carpi radialis intermedius tendon (white arrow) is shown in its typical location between and deep to the extensor carpi radialis longus (ECRL) (L) and extensor carpi radialis brevis (B) tendons. Note thickening and hypoechoic heterogeneity of the ECRL tendon consistent with tendinosis. (C) A correlative T2-weighted axial MRI scan of the same patient again shows the extensor carpi radialis intermedius tendon (white arrow) between and deep to the ECRL (L) and extensor carpi radialis brevis (B) tendons. The dotted rectangle represents the relative sonographic field of view represented in image B. LT ¼ Lister’’s tubercle; RAD ¼ radius; ULN ¼ ulnar. (Note: The MRI image was inverted for orientation purposes.) PM R 7 (2015) 789-791