Against the Odds: Massive Lumbar Intradural Disk Herniation in the Elderly

Construction and validation of a nomogram prediction model for postoperative recurrence of lumbar disc herniation treated with percutaneous laminectomy

The aim was to investigate the independent risk factors for postoperative recurrence of lumbar disc herniation treated by percutaneous intervertebral laminectomy, and to establish a nomogram prediction model accordingly. Data on patients with lumbar disc herniation were collected from January 2018 to December 2023 in our hospital, and single-factor and multifactorial logistic regression analyses were used to determine the independent risk factors for postoperative recurrence of lumbar disc herniation and establish the corresponding nomogram. The receiver operating characteristic curves were plotted the area under the curve was calculated, and the calibration curves and decision curves were plotted to evaluate the model performance. A total of 644 patients with lumbar disc herniation were included in the study, and 61 patients had a postoperative recurrence, with a recurrence rate of 9.5%. After univariate and multivariate logistic regression model analysis, a total of 7 variables were identified as independent risk factors for postoperative recurrence of lumbar disc herniation: age > 60 years (OR, 3.709; 95% CI, 1.284-10.714), type of nucleus pulposus protrusion as herniation (OR, 7.342; 95% CI, 1.500-35.929), nucleus pulposus degeneration grade III-V (OR, 4.068; 95% CI, 1.214-13.627), operative segment L4-L5 (OR, 5.060; 95% CI, 1.659-15.431), incomplete intraoperative medullary removal (OR, 5.355; 95% CI, 2.017-14.220), and broken fibrous ring (OR, 5.229; 95% CI, 1.235-22.142), and postoperative high-intensity activity (OR, 5.096; 95% CI, 1.420-17.669). The nomogram constructed in this study for postoperative recurrence of lumbar disc herniation treated by percutaneous intervertebral foramenoscopy has good predictive accuracy, which helps orthopedic surgeons to intervene in advance in patients at high risk of postoperative recurrence of lumbar disc herniation treated by percutaneous intervertebral foramenoscopy.

Intradural Disc Herniation in the Setting of Congenital Lumbar Spinal Stenosis

INTRODUCTION

Accounting for an estimated 1.10-1.76% of all lumbar herniations, lumbar intradural disc herniation (IDH) occurs primarily in males during the fourth to fifth decades of life. While not validated, congenital lumbar spinal stenosis (CLSS) is implicated as one precipitating factor for IDH.

CASE REPORT

We report 28-year-old Hispanic female with CLSS, severe obesity, and degenerative disk disease, with a history of minimally invasive surgical (MIS) decompression for a large paracentral L4-5 disc herniation at 25. After three years, the patient developed sudden burning dysesthesias in the L4-5 dermatomes bilaterally and temporary leg weakness. Lumbar magnetic resonance imaging exhibited severe L4-5 spinal stenosis, and the patient underwent repeat MIS decompression, which again provided her with adequate symptom resolution. However, 20 days postoperatively she developed cauda equina syndrome with anal dysfunction, and bilateral leg and foot weakness. Upon open surgical exploration we discovered a tense L4-5 dural protrusion. After a dorsal durotomy, a large IDH with a ventral dural tear was identified. Subsequent to adequate debulking of the IDH, the ventral tear was repaired, and an expansile duraplasty was performed. Overall, the patient's bladder and bowel function, pain, hypoesthesia, and motor strength all improved. Two weeks after surgery she presented with a lumbar pseudomeningocele that was managed conservatively.

CONCLUSION

This report not only highlights an atypical presentation of IDH and is the first case of CLSS linked with IDH, lending support to the hypothesis that CLSS can lead to IDH, but also provides a comprehensive review of IDHs.

Intradural Lumbar Disc Herniation: A Case Report and Literature Review

Background

Lumbar disc herniation into the dural space is a very rare phenomenon of degenerative lumbar lesions in the elderly population, and its potential pathogenesis and natural course remain unclear.

Case description

We describe a rare case of intradural lumbar disc herniation. A 68-year-old man presented with progressive lower back pain and radiating pain and numbness in both legs for 3 years. Magnetic resonance imaging revealed a large herniated disc at L4-L5. Posterior discectomy and fusion of the L4-L5 was performed after conservative treatment failed. Intraoperatively, only minimal disc fragments in the epidural space were found after meticulous probing following laminectomy of the L4-L5 vertebrae. The dorsal dura mater was saturated, tense, and bulged at the L4-L5 levels; additionally, an intradural mass was palpable and confirmed by intraoperative ultrasonography. Subsequently, dorsal middle durotomy was performed. Upon opening the dural sac, a large cauliflower-like mass similar to nucleus pulposus tissue was found near the arachnoid membrane. The mass was dissociative and could be completely resected. The dorsal dural incisions were closed after careful exploration, followed by fixation and fusion of the L4-L5 levels. Pathological examination revealed disc tissue with central balloon-type cystic degenerative changes. The patient’s lower back pain and radiating pain and numbness of both legs improved remarkably postoperatively, and he became asymptomatic at 3 months postoperatively.

Conclusion

Intradural lumbar disc herniation should be highly suspected when intraoperative findings are incompatible with findings from the preoperative imaging examination, and it could be further confirmed via intraoperative ultrasonography and pathological examination of the resected tissue from the dural space. Prompt surgery is recommended, and surgical results are usually favorable. We also reviewed the literature and discussed the potential pathogenesis, natural course, diagnosis, and treatment of intradural lumbar disc herniation.

Intradural Disc a Diagnostic Dilemma: Case Series and Review of Literature

Introduction:

We present a case series of six cases of intradural disc herniation at L4–L5 level diagnosed on the basis of intraoperative findings.

Result:

All our cases, on preoperative magnetic resonance imaging (MRI) were reported as having diffuse annular bulge with large posterocentral extrusion. Our study comprised patients in age group of 30–60 years. Four cases out of six presented with cauda equina syndrome. In three cases, cauda equina was associated with sudden deterioration in the power of lower limb muscle groups.

Discussion:

We suspect that intradural herniation of disc was synchronous with cauda equina syndrome in these cases, which was very well documented in one of the cases. On retrospective analysis, MRI findings of mass effect in the form of displacement of the traversing nerve roots due to large central disc with crumble disc sign were suggestive of early evidence of intradural disc herniation. Y sign in ventral dura due to splitting of ventral dura and arachnoid mater by disc material was a good diagnostic sign to suspect intradural extra-arachnoid disc. The presence of hypointense structure inside the dura with no continuity with the adjacent intervertebral disc on MRI was highly suggestive of an intradural disc.

Conclusion:

Intradural disc prolapse remains a diagnostic dilemma as it is very difficult to diagnose all the cases preoperatively. The presence of above-mentioned radiological signs on MRI in patients having the large central disc on MRI, especially at L4–L5 levels, should raise suspicion of intradural herniation of disc.

Severe Intradural Lumbar Disc Herniation with Cranially Oriented Free Fragment Migration

BACKGROUND

Intrathecal disc herniation is a rare but serious condition that has the potential to generate devastating neurologic deficits. We present a case of a 56-year-old man who developed cauda equina syndrome after several episodes of severe Valsalva maneuver.

CASE DESCRIPTION

The patient was found to have developed subacute urinary retention and leg weakness. Magnetic resonance imaging findings were concerning for an unusual-appearing lesion extending cranially at L2-3. Urgent decompression via an L2 laminectomy, exploration, and subsequent discectomy was performed. The patient recovered exceptionally well, regaining bladder function and ultimately being able to ambulate without assistance.

CONCLUSIONS

Cranially extending intrathecal disc herniations are a rare phenomenon and exceptionally uncommon above L3. The clinician should have a high level of suspicion for herniation when looking at the clinical and historical information consistent with such a diagnosis even in the presence of ambiguous imaging findings.