Comparison of MR and EMG findings
Electrophysiologic Findings | MR Findings | N | Age (y) | Duration of Symptoms | Cause | Atrophy (N) | Additional Confirmation of Diagnosis |
---|---|---|---|---|---|---|---|
Concordant Findings | |||||||
Peroneal nerve palsy | Peroneal nerve lesion | 18 | 18–72 (median, 42) | 3 days–12 months (median, 3 months) | Spontaneous, n = 11; trauma, n = 7; iatrogenic, n = 2 | 6 | Surgery, n = 3 |
L5 radiculopathy | L5 lesion | 8 | 34–81 (median, 58) | 2 weeks–2 months (median, 4 weeks) | Disk herniation, n = 8; spinal stenosis, n = 1 | 0 | Surgery, n = 7; lumbar CT or MR, n = 8 |
Sciatic nerve lesion | Unspecific | 8 | 17–69 (median, 35) | 2 weeks–12 months (median, 6 months) | Trauma, n = 4; iatrogenic, n = 3; mononeuritis, n = 1 | 6 | None |
L5 and S1 radiculopathy | Unspecific | 1 | 44 | 2 months | Disk herniation | No | Spinal CT, surgery |
Lumbosacral plexus lesion | Unspecific | 1 | 57 | 1 month | Iatrogenic (surgery for rectal carcinoma) | No | EMG |
Cauda equina lesion | Unspecific | 1 | 34 | 3 months | Spinal adhesions | Yes | Surgery |
Discordant Findings | |||||||
L5 radiculopathy | Unspecific | 1 | 35 | 2 months | Disk herniation | No | Lumbar CT, surgery |
Peroneal nerve palsy | L5 lesion | 1 | 40 | 5 weeks | Disk herniation | No | Lumbar CT, surgery |
Partial peroneal nerve palsy | Complete distal peroneal nerve lesion | 1 | 42 | 5 months | Traumatic peroneal nerve lesion | No | Follow-up EMG |