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Cary D. Alberstone, Frederick W. Rupp and John A. Anson

U Spinal aneurysms are rare, and those not associated with either an arteriovenous malformation or coarctation of the aorta are particularly rare. In this report, the authors present a case of spinal aneurysm involving the lateral sacral artery. The aneurysm presented as a cauda equina syndrome 6 years after the patient underwent a renal transplant contralateral to the side of the aneurysm parent vessel. To the authors' knowledge, only one similar case has been previously reported. They conclude that spinal aneurysms should be included in the differential diagnosis of an extramedullary spinal mass lesion.

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Paul E. Kaloostian, Han Chen, Frederick Rupp and Erich Marchand

The authors report the case of a 16-year-old boy with pre-B cell acute lymphocytic leukemia diagnosed 2 weeks earlier. On workup for diffuse headaches he was found to have 10-mm bilateral subdural hygromas with compression of the underlying gyri. He was followed clinically, and 4 days after his initial presentation he underwent MRI studies of the brain, which showed complete resolution of the subdural fluid collections. No change in management was noted during these 4 days. This case is the first known instance of rapid, spontaneously disappearing bilateral subdural hygromas in a pediatric patient.

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Sait Naderi, Cary D. Alberstone, Frederick W. Rupp, Edward C. Benzel and Nevan G. Baldwin

Forty-four patients with cervical spondylotic myelopathy who underwent a ventral surgical approach were evaluated with respect to the results of surgery. The neurological status of the patients was categorized according to the modified Japanese Orthopedic Association scale (0-18). Three patients had a functional score of 8, one patient 9, five patients 10, five patients 11, seven patients 12, seven patients 13, seven patients 14, and nine patients had a functional score of 15, preoperatively. Twenty-three patients underwent a one-level corpectomy, 15 patients a two-level corpectomy, and six patients underwent a three-level corpectomy. Forty-one (93.1%) of the 44 patients underwent ventral cervical plate fixation. Complications among the 44 patients included graft-and instrumentation-related complications in seven cases, iliac crest donor-site infection in three cases, and respiratory complications in three cases. The follow-up periods ranged between 7 and 60 months (mean 42.3 months). Overall, the fusion rate was 97.72%. Three patients showed no functional change (6.8%), two patients were worse (4.5%), and 39 patients (88.6%) showed functional improvement in their score between +1 and +6 points (mean 2.16 points). There was no statistically significant difference in the functional improvement score in patients younger or older than 60 years old. The mean improvement in the functional score was found to be +2.857 ± 1.352, +2.400 ± 1.454, and +0.5000 ± 1.871 following one-level corpectomy, two-level, and three-level corpectomies, respectively. There were statistically significant differences in the neurological improvement observed between patients with one-level corpectomy and three-level corpectomy (p < 0.01), as well as between those with two-level and three-level corpectomy (p < 0.05). There was no statistically significant difference in the neurological outcome between patients with one-level and two-level corpectomy (p > 0.05). The results of this study demonstrate a high rate of solid bone fusion and a high rate of functional (neurological) improvement. Five patients underwent reoperation, predominantly for instrumentation failure. The use of instrumentation dictates careful consideration of the risk/benefit ratio associated with its use in each case.