Nemaline myopathy (NM) encompasses a large spectrum of myopathies characterized by hypotonia, weakness and depressed or absent deep tendon reflexes, with pathologic evidence of nemaline bodies (rods) on muscle biopsy. The disease is nemaline myopathy (MONDO_0018958). Also known as: NEM, NM, nemaline body disease, nemaline rod myopathy, rod myopathy.