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In page Inclusion body myositis:

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IBM is often initially misdiagnosed as polymyositis. A course of prednisone is typically completed with no improvement and eventually, sIBM is confirmed. sIBM weakness comes on over months or years and progresses steadily, whereas polymyositis has an onset of weeks or months. Muscular dystrophy (e.g., limb girdle muscular dystrophy) must be considered as well.[citation needed] sIBM can be mistaken for physical deconditioning.[1]