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• W3161528495 abstract "Scleromyositis (SM) is an emerging subset of myositis associated with features of systemic sclerosis (SSc) but it is currently not recognized as a distinct histopathological subset by the European NeuroMuscular Center (ENMC). Our aim was to review studies reporting muscle biopsies from SSc patients with myositis and to identify unique histopathological features of SM. A scoping review was conducted and included all studies reporting histopathological findings in SSc patients with myositis searching the following databases: PubMed, MEDLINE, EMBASE, CINAHL and EBM-Reviews. Clinical, serological, and histopathological data were extracted using a standardized protocol. Out of 371 citations, 77 studies that included 559 muscle biopsies were extracted. Fifty-seven percent ( n = 227/400) had inflammatory infiltrates , predominantly T cells , which were endomysial (49%), perimysial (42%) and perivascular (41%). Few studies (18%, n = 8/44) evaluated the presence of B-cells. Myofiber atrophy was present in 48% ( n = 104/218) of biopsies, and was predominantly perifascicular in 19% ( n = 6/31), with necrosis reported in 56% ( n = 162/290) of cases. Sarcolemmal MHC-I upregulation was found in 72% ( n = 64/89) of biopsies. Non-specified C5b-9 deposition was described in 39% of muscle biopsies ( n = 28/72). Neurogenic features were present in 23% ( n = 44/191); endomysial fibrosis was reported in 35% ( n = 120/340); and rimmed vacuoles were observed in 32% ( n = 11/34) of biopsies. Capillaropathy, such as capillary dropout and/or ultrastructural endothelial abnormalities, was reported in 33% ( n = 43/129) of cases. Reported ENMC categories were mainly polymyositis (21%), non-specific myositis (19%), immune-mediated necrotizing myopathy (16%), and dermatomyositis (8%). Histopathological features were analyzed according to serological subtypes in 28 studies, including anti-PM-Scl ( n = 48), -Ku ( n = 23) and -U1RNP ( n = 90). Most of these biopsies demonstrated inflammatory infiltrates (range 49–85%) as well as MHC-I expression (range 63–81%). Necrosis was associated with anti-Ku (85%) and anti-U1RNP (73%), while anti-Ku was also associated with neurogenic features and rimmed vacuoles in 57% and 25% of cases, respectively. Our review suggests that SM is characterized by heterogeneous pathological features using definitions included in current histopathological criteria. Whether a distinct histopathological signature exists in SM remains to be determined. SSc-specific and SSc-associated autoantibodies may help define more homogeneous histopathological subsets. • Scleromyositis is an emerging myositis subset with features of systemic sclerosis. • Few studies have focused on scleromyositis histopathological features. • Scleromyositis is heterogeneous using current histopathological criteria. • Autoantibodies may help define more homogeneous histopathological subsets. • A distinct histopathological signature in scleromyositis remains to be determined." @default.
• W3161528495 created "2021-05-24" @default.
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• W3161528495 date "2021-07-01" @default.
• W3161528495 modified "2023-10-18" @default.
• W3161528495 title "Histopathological features of systemic sclerosis-associated myopathy: A scoping review" @default.
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