Postoperative lumbar CT: technique, results, and indications

Area of Science:

• Neurosurgery
• Radiology
• Medical Imaging

Background:

• Recurrent radicular symptoms after lumbar disk herniation surgery pose diagnostic challenges.
• Differentiating recurrent herniation from post-operative scar tissue is crucial for effective treatment.

Purpose of the Study:

• To evaluate the utility of intravenously enhanced computed tomography (CT) in differentiating recurrent lumbar disk herniation from scar tissue.
• To assess the diagnostic accuracy of enhanced CT in patients with persistent radicular symptoms post-surgery.

Main Methods:

• Seventy-seven patients with post-operative recurrent radicular symptoms underwent both plain and intravenously enhanced CT scans.
• Analysis focused on contrast enhancement patterns to distinguish scar tissue from herniated disk material.

Main Results:

• Scar tissue demonstrated definite contrast enhancement, while recurrent herniation remained unenhanced on postcontrast scans.
• Symmetrical, undisplaced nerve roots were identified in 88% of hypertrophic scar cases, excluding recurrent herniation.
• Dural calcifications were observed in five patients with hypertrophic scarring.

Conclusions:

• Intravenously enhanced CT is the preferred method for evaluating recurrent radicular symptoms after lumbar disk herniation surgery.
• The technique reliably differentiates scar tissue from recurrent disk herniation, guiding clinical decisions.