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Inclusion body myositis: A differential diagnosis to consider in patients with myopathy refractory to immunosuppressants. Two case reports
Miopatía por cuerpos de inclusión: un diagnóstico diferencial que considerar en pacientes con miopatía refractaria a inmunosupresores. Reporte de 2 casos
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Fernando Bolaños-Toroa, Daniel Arias-Jaramilloa, Manuela Aun-Mejíaa, Juliana Castro-Henaoa, Daniel G. Fernández-Ávilac, Lina María Saldarriaga-Riveraa,b,
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vasculitisreumato@gmail.com

Corresponding author.
a Internal Medicine Research Group, School of Medicine, Technological University of Pereira, Pereira, Risaralda, Colombia
b Service of Rheumatology, Clínica Los Rosales, Pereira, Risaralda, Colombia
c Service of Rheumatology, Hospital Universitario San Ignacio, Bogotá, Colombia
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Received 28 January 2020. Accepted 05 May 2020
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Table 1. Serological characteristics of the treated patients.
Abstract

Inclusion body myositis is part of the group of inflammatory myopathies, representing 30% of this group of diseases, and is considered an orphan disease because its estimated prevalence is less than 5 per 10,000 inhabitants. It produces weakness and atrophy of the proximal and distal muscles. The pathophysiological mechanisms are mainly autoimmune, inflammatory, and degenerative. The cases are presented of two female patients who came to the emergency department due to progressive loss of upper and lower limb strength, and progressive asymmetric muscle weakness.

Keywords:
Myositis
Inclusion bodies
Muscular weakness
Biopsy
Electromyography
Resumen

La miositis por cuerpos de inclusión hace parte del grupo de las miopatías inflamatorias, representando el 30% de este grupo de enfermedades, es considerada una enfermedad huérfana ya que se estima que su prevalencia es menor a 5 por cada 10.000 habitantes. Produce debilidad y atrofia de los músculos proximales y distales. Los mecanismos fisiopatológicos son principalmente autoinmunes, inflamatorios y degenerativos. Se presentan 2 casos de mujeres quienes acudieron a urgencias por pérdida progresiva de la fuerza en miembros superiores e inferiores, debilidad muscular asimétrica de curso progresivo.

Palabras clave:
Miositis
Cuerpos de inclusión
Debilidad muscular
Biopsia
Electromiografía

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