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Lumbosacral extradural arachnoid cysts: diagnostic and indication for surgery
U Kunz1, U M Mauer, H Waldbaur
1Armed Forces Hospital, Department of Neurosurgery, Ulm, Germany. ulrich.kunz@extern.uni-ulm.de
Summary
Surgical treatment for lumbosacral extradural arachnoid cysts yielded limited success. Conservative management showed comparable results, suggesting surgery is best for patients with short pain history and clear deficits.
Area of Science:
- Neurosurgery
- Spinal Surgery
- Radiology
Background:
- Lumbosacral extradural arachnoid cysts (LEACs) lack established surgical indications.
- This study compares operative and conservative treatments for LEACs to define surgical success standards.
Observation:
- Eight patients with LEACs underwent surgery, and eight were treated conservatively over nine years.
- Postoperative pain relief occurred in only three surgically treated patients, with none becoming symptom-free.
- One patient with a one-year preoperative history achieved lasting success after surgery.
- Magnetic resonance imaging (MRI) without contrast was misinterpreted in two cases.
Findings:
- Surgical outcomes for LEACs were comparable to conservative treatment results.
- MRI is the optimal diagnostic tool, requiring diverse sequences for accurate interpretation.
- Patients benefiting most from surgery had a short pain history and distinct neurological deficits.
Implications:
- Surgery for LEACs should be reserved for carefully selected patients.
- Conservative management may be preferred for LEACs presenting with subtle, non-specific symptoms.
- Standardized diagnostic protocols using multi-sequence MRI are crucial for LEAC evaluation.