Denervation atrophy Electrophysiological evidence of denervation with intact motor and sensory nerve conduction findings must be made by using nerve conduction studies, usually in conjunction with EMG. The presence of polyphasic potentials and fibrillation at rest are characteristic of<unk>  dSMA. The following are useful in diagnosis: * Nerve conduction studies (NCS), to test for denervation * Electromyography (EMG), also to detect denervation * X-ray, to look for bone abnormalities * Magnetic resonance imaging (MRI) * Skeletal muscle biopsy examination * Serum creatine kinase (CK) level in blood, usually elevated in affected individuals * Pulmonary function test
Congenital distal spinal muscular atrophy
Congenital muscular dystrophy
Spinal muscular atrophies
Distal hereditary motor neuronopathies
Spinal muscular atrophy
Jokela type spinal muscular atrophy
Spinal muscular atrophy with lower extremity predominance 1
Monomelic amyotrophy