magnetic resonance imaging of lumbar spine: 'bone within a bone' appearance of L4 vertebra
magnetic resonance imaging of lumbar spine: 'bone within a bone' appearance of l4 vertebra
magnetic resonance imaging of lumbar spine: 'bone within a bone' appearance of L4 vertebra (procedure)
magnetic resonance imaging of lumbar spine: 'bone within a bone' appearance of l4 vertebra (procedure)