<prompt> Perifascicular atrophy of muscle fibres is seen in -Steroid myopathyDermatomyositisInclusion body myositisNemaline myopathy  <response>: Dermatomyositis is a connective-tissue disease related to polymyositis that is characterized by inflammation of the muscles and the skin.It is a systemic disorder that may also affect the joints, the esophagus, the lungs, and, less commonly, the heart.On the muscle biopsy, there are two classic microscopic findings of dermatomyositis. They are : mixed B- T-cell perivascular inflammatory infiltrate and perifascicular muscle fiber atrophy.It is associated with autoantibodies, especially anti-Jo 1 antibody. 