Transverse view comparisons of a painful left medial collateral ligament (MCL) and the right asymptomatic ligament. The left ligament is thickened with mixed echogenicity, which is representative of a partial tear. (nl, normal; pain, painful.) Source: Musculoskeletal Ultrasound, CURRENT Diagnosis & Treatment: Physical Medicine & Rehabilitation Citation: Maitin IB, Cruz E. CURRENT Diagnosis & Treatment: Physical Medicine & Rehabilitation; 2015 Available at: https://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/Books/1180/mai_ch39_f022.png&sec=70383176&BookID=1180&ChapterSecID=70383119&imagename= Accessed: October 29, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved