Ultrasound and MRI findings in rheumatoid arthritis in three patients Ultrasound and MRI findings in rheumatoid arthritis in three patients. (A-C) 65-year-old woman with rheumatoid arthritis and trigger finger. Transverse (A) and longitudinal (B,C) images show a thickened and heterogeneous flexor tendon (T) with hypoechoic thickening (*). (C) Color Doppler image shows hyperemia surrounding the tendon. (Ultrasound images used with permission from Dr Frank Malara, Austin Hospital, Melbourne, Australia). (D-I) MR images in two different patients depicting erosions (white arrows), synovitis (black arrows), and tenosynovitis (white arrowheads). Source: Musculoskeletal, Introduction to Diagnostic Radiology Citation: Elsayes KM, Oldham SA. Introduction to Diagnostic Radiology; 2015 Available at: https://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1562/elsayes_ch07_fig-c3-01.png&sec=95878579&BookID=1562&ChapterSecID=95878512&imagename= Accessed: November 15, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved