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1.  Transient cauda equina syndrome related to a sacral schwannoma with cauda equine compression after a lumbar epidural block -A case report- 
Korean Journal of Anesthesiology  2010;59(Suppl):S222-S225.
A 53-year-old man had chronic low back and leg pain for four years without any history of trauma or neurological manifestations. There was a reduction in symptoms after a lumbar epidural block. Two hours later after the procedure, the patient complained of perineal numbness and lower extremity weakness. The neurological evaluation revealed loss of sensation in the saddle area and the posterior aspect of the leg. The deep-tendon reflexes were decreased in the leg. The patient was unable to urinate. The MRI revealed a schwannoma at the S3 level of the sacral spine with cauda equina compression. The patient's symptoms improved slightly over the next few hours. The patient had a gradual return of motor function and could feel the Foley catheter. All of the symptoms completely resolved over the next nine hours and the patient was discharged to home once completely recovered. This case illustrates the importance of clinical examination and continued vigilance for evaluation of neurological deterioration after epidural injections.
doi:10.4097/kjae.2010.59.S.S222
PMCID: PMC3030042  PMID: 21286446
Cauda equina syndrome; Low back pain; Schwannoma
2.  Spinal Nerve Root Swelling Mimicking Intervertebral Disc Herniation in Magnetic Resonance Imaging -A Case Report- 
The Korean Journal of Pain  2010;23(1):51-54.
A herniated intervertebral disc is the most common type of soft tissue mass lesion within the lumbar spinal canal. Magnetic resonance imaging (MRI) is a useful tool for the assessment of patients with lower back pain and radiating pain, especially intervertebral disc herniation. MRI findings of intervertebral disc herniation are typical. However, from time to time, despite an apparently classic history and typical MRI findings suggestive of disc herniation, surgical exploration fails to reveal any lesion of an intervertebral disc. Our patient underwent lumbar disc surgery with the preoperative diagnosis of lumbar disc herniation; however, nothing could be found during the surgical procedure, except a swollen nerve root.
doi:10.3344/kjp.2010.23.1.51
PMCID: PMC2884213  PMID: 20552074
herniated intervertebral disc; magnetic resonance imaging; nerve root

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