Examples of MRI findings in patients with DM or PM

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Presentation transcript:

Examples of MRI findings in patients with DM or PM Examples of MRI findings in patients with DM or PM. (A) Structures with HSI (s, subcutaneous adipose tissue; f, fascia) and distributions of HSI areas in muscle (d, diffuse; pa, patchy; pe, peripheral) appear white. Examples of MRI findings in patients with DM or PM. (A) Structures with HSI (s, subcutaneous adipose tissue; f, fascia) and distributions of HSI areas in muscle (d, diffuse; pa, patchy; pe, peripheral) appear white. (B) Patterns of HSI in muscle. (C) STIR image of the left upper arm of a patient with DM. Structures with HSI are the subcutaneous adipose tissue (arrow), fasciae (arrowheads) and muscles. Distribution and pattern of HSI in the biceps muscle are diffuse and honeycomb, respectively (within the square). (D) Higher magnification image of the square in (C). (E) Gd-T1WI image of the thighs of a patient with DM. Structures with HSI are the bilateral quadriceps fasciae (arrowheads) and muscles. HSI distribution in the quadriceps muscles is peripheral (arrows). (F) Gd-T1WI image of the right thigh of a patient with DM. Distribution and pattern of HSI in the right rectus femoris muscle are diffuse and SHSI (arrow), respectively. (G) Gd-T1WI image of the right thigh of a patient with PM. There is diffuse HSI in the vastus lateralis muscle and patchy HSI in the rectus femoris, gracilis and semitendinosus muscles, producing a foggy pattern (arrows). DM, dermatomyositis; Gd-T1WI, gadolinium-enhanced fat-suppressed T1-weighted imaging; HSI, high signal intensity; PM, polymyositis; SHSI, strong high signal intensity; STIR, short-tau inversion recovery. Taro Ukichi et al. RMD Open 2019;5:e000850 Copyright © BMJ Publishing Group & EULAR. All rights reserved.