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The specific sagittal magnetic resonance imaging of intradural extra-arachnoid lumbar disc herniation.

Sasaji T, Horaguchi K, Yamada N, Iwai K - Case Rep Med (2012)

Bottom Line: Few MRI findings have been reported.We reviewed the preoperative MRI findings.We speculated that the two lines comprised the dura and arachnoid and that a disc herniation existed between them.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopedic Surgery, Fukushima Rosai Hospital, 3-Numajiri, Tsuzura-machi, Uchigo, Iwaki 973-8403, Japan.

ABSTRACT
Intradural extra-arachnoid lumbar disc herniation is a rare disease. Few MRI findings have been reported. We experienced an intradural extra-arachnoid lumbar disc herniation. We reviewed the preoperative MRI findings. Lumbar spine T2-weighted sagittal MRI showed that one line of the ventral dura was divided into two by a disc herniation. We speculated that the two lines comprised the dura and arachnoid and that a disc herniation existed between them. We believe that division of the ventral dural line on T2-weighted sagittal images is a characteristic finding of intradural extra-arachnoid lumbar disc herniation. The division of ventral dural line seemed to be a "Y," and, thus, we called it the "Y sign." The "Y sign" may be useful for diagnosing intradural extra-arachnoid lumbar disc herniation.

No MeSH data available.


Related in: MedlinePlus

Intraoperative ultrasonography. Disc herniation was discovered in the dura (white arrow).
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fig2: Intraoperative ultrasonography. Disc herniation was discovered in the dura (white arrow).

Mentions: The lumbar spine was explored through a straight posterior midline approach. Partial laminectomy at L2-L3 revealed no disc herniation in the epidural space. We identified a disc herniation in the dura with an ultrasonography (Figure 2). Durotomy revealed fragments covered with the arachnoid (Figure 3). After removing the fragments, we found a hole in the ventral aspect of the dura; this hole was connected to the disc space. We did not suture the ventral dural defect to avoid the risk that threads irritate cauda equina.


The specific sagittal magnetic resonance imaging of intradural extra-arachnoid lumbar disc herniation.

Sasaji T, Horaguchi K, Yamada N, Iwai K - Case Rep Med (2012)

Intraoperative ultrasonography. Disc herniation was discovered in the dura (white arrow).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3295378&req=5

fig2: Intraoperative ultrasonography. Disc herniation was discovered in the dura (white arrow).
Mentions: The lumbar spine was explored through a straight posterior midline approach. Partial laminectomy at L2-L3 revealed no disc herniation in the epidural space. We identified a disc herniation in the dura with an ultrasonography (Figure 2). Durotomy revealed fragments covered with the arachnoid (Figure 3). After removing the fragments, we found a hole in the ventral aspect of the dura; this hole was connected to the disc space. We did not suture the ventral dural defect to avoid the risk that threads irritate cauda equina.

Bottom Line: Few MRI findings have been reported.We reviewed the preoperative MRI findings.We speculated that the two lines comprised the dura and arachnoid and that a disc herniation existed between them.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopedic Surgery, Fukushima Rosai Hospital, 3-Numajiri, Tsuzura-machi, Uchigo, Iwaki 973-8403, Japan.

ABSTRACT
Intradural extra-arachnoid lumbar disc herniation is a rare disease. Few MRI findings have been reported. We experienced an intradural extra-arachnoid lumbar disc herniation. We reviewed the preoperative MRI findings. Lumbar spine T2-weighted sagittal MRI showed that one line of the ventral dura was divided into two by a disc herniation. We speculated that the two lines comprised the dura and arachnoid and that a disc herniation existed between them. We believe that division of the ventral dural line on T2-weighted sagittal images is a characteristic finding of intradural extra-arachnoid lumbar disc herniation. The division of ventral dural line seemed to be a "Y," and, thus, we called it the "Y sign." The "Y sign" may be useful for diagnosing intradural extra-arachnoid lumbar disc herniation.

No MeSH data available.


Related in: MedlinePlus