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External Landmarks for Identifying the Drainage Site of the Vein of Labb É : Application to Neurosurgical Procedures

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External Landmarks for Identifying the Drainage Site of the Vein of Labb É : Application to Neurosurgical Procedures British Journal of Neurosurgery, June 2012; 26(3): 383–385 © 2012 The Neurosurgical Foundation ISSN: 0268-8697 print / ISSN 1360-046X online DOI: 10.3109/02688697.2011.631620 ORIGINAL ARTICLE External landmarks for identifying the drainage site of the vein of Labb é : application to neurosurgical procedures R. Shane Tubbs 1 , Robert G. Louis Jr. 2 , Young-Bin Song 1 , Martin Mortazavi1 , Marios Loukas 3 , Mohammadali M. Shoja 4 & Aaron A. Cohen - Gadol 5 * 1 Pediatric Neurosurgery, Children ’ s Hospital, Birmingham, Alabama, USA, 2 Department of Neurosurgery, University of Virginia, Charlottesville, Virginia, USA, 3 Department of Anatomical Sciences, St. George ’ s University, Grenada, 4 Neuroscience Research Center, Tabriz University of Medical Sciences, Tabriz, Iran, and 5 Goodman Campbell Brain and Spine, Indiana University Department of Neurological Surgery, Indianapolis, Indiana, USA Abstract transverse sinus and is one of the most important draining Introduction. The vein of Labb é is an important structure of veins of the temporal and parietal regions. 1 – 3 Injury and the lateral cortical surface. However, to date, studies aimed at damage to the vein of Labb é may lead to postoperative lobar providing external landmarks for aiding in its identifi cation venous infarction and associated morbidity.1 – 4 Th erefore, have been scant. Therefore, the present study focussed on identifying and preserving this vessel during, for example, establishing reliable bony landmarks for localizing this deeper subtemporal approaches or tentorial division is important lying venous structure. Materials and methods. Fifteen adult in avoiding iatrogenic injury such as avulsion or thrombosis cadavers (30 sides) underwent dissection of the lateral cortical with prolonged retraction. 1,5 brain surface with special attention given to the drainage site Positionally, Oka et al. 5 found the vein of Labb é at the of the vein of Labb é into the transverse sinus. Measurements level of the middle temporal vein in 12 specimens, the poste- of the distance from this site to surrounding external bony rior temporal vein in 6, and the anterior temporal vein in 2. landmarks were then made. Results. We found that this drainage Gaillard6 described the position of this vein as midtemporal For personal use only. site into the transverse sinus was 0.8 – 1.5 cm (mean 1.1 cm, SD in 60%, posterior temporal in 30% and anterior temporal in 0.567) superior to the superior border of the zygomatic arch 10%. Bigelow et al. 7 acknowledged the variability of this vein and 2 – 5 cm (mean 2.9 cm, SD 0.713) posterior to the opening as it may cross the temporal lobe as far back as the posterior of the external auditory meatus. Statistically, there was no limit of the lobe or as far forward as the anterior one-third of signifi cance between left and right sides or between sexes. its lateral surface. In addition, some studies have identifi ed Conclusions. We found that the junction between the vein of more than one vein of Labb é per side.2,8 Although Sood and Labb é and transverse sinus may be variable. Nonetheless, colleagues9 observed similar fi ndings to Koperna et al.,1 they additional landmarks found in this study for identifying the observed size diff erences. By analyzing 47 epilepsy patients junction may aid in its earlier identifi cation during surgery, who underwent temporal lobe resection, Sindou et al. 3 found potentially decreasing operative morbidity. that 76.6% of patients had a dominant vein of Labb é . Of those Br J Neurosurg Downloaded from informahealthcare.com by St Joseph Hospital on 08/31/14 who had a small vein of Labb é , the mean number of superfi - Keywords: anatomy; neurosurgery; landmarks; cranial; venous cial lateral temporal veins was signifi cantly greater, with 60% system. having three or more veins, compared to the mean number of superfi cial lateral temporal veins among the patients with a prominent vein of Labb é .3 Finally, as noted in the study of Introduction Oka et al. 5 the veins of Labb é and Trolard show an inverse Th e vein of Labb é (Charles Labb é 1851 – 1889), also known as relationship to one another; if one predominates, the other the inferior anastomotic vein, plays an important role in the vein is small or absent. Th e vein of Labb é has been found to superfi cial cerebral venous system. Th is 2 – 3-mm diameter be dominant on the left side in 42% and on the right side in vessel unites the superfi cial middle cerebral vein with the 21% of patients, whereas the vein of Trolard has been found * Author Contributions: A.A. Cohen-Gadol, R.S. Tubbs and R.G. Louis, Jr. conceived and designed the study. R.S. Tubbs, R.G. Louis, Jr. and Y.-B. Song gathered the data. All authors interpreted and analyzed the data. R.S. Tubbs, R.G. Louis, Jr. and A.A. Cohen-Gadol drafted the manuscript. R.S. Tubbs and A.A. Cohen- Gadol critically revised the manuscript. All authors approved the fi nal manuscript for submission. Correspondence: Aaron A. Cohen-Gadol, MD, MSc, Department of Neurological Surgery, Goodman Campbell Brain and Spine, Indiana University 1801 N. Senate Blvd, Suite 610, Indianapolis, IN 46202. Tel: ϩ 317-362-8760. Fax: 317-924-8472. E-mail: [email protected] Received for publication 14 September 2011 ; accepted 8 October 2011 383 384 R. Shane Tubbs et al. to be dominant on the left side in 24% and right side in 52% Results of patients. 6 Th e aim of the present study was to identify reliable super- Th e vein of Labb é drained into the transverse sinus on all fi cial landmarks for localizing the drainage site of the vein of sides. One right side had three tributaries of this vein and Labb é with the hopes of decreasing surgical morbidity that the most anterior of these was used for measurements. Th e may follow surgical procedures in this region. drainage site of the vein of Labb é was found to lie 0.8 – 1.5 cm (mean 1.1 cm, SD 0.567) superior to the zygomatic arch, and 2 – 5 cm (mean 2.9 cm, SD 0.713) posterior to the opening of Materials and methods the external auditory meatus. Statistically, no diff erence was ϭ Fifteen (30 sides) adult (aged 49 – 88 years at death, mean 74 found between left or right sides or between sexes ( P 0.563 ϭ years) latex-injected fresh cadavers underwent dissection and P 0.679, respectively). No intracranial pathology or of the lateral cortical surface of the brain. Th ese comprised anomaly was noted in any specimen. 9 male and 6 female specimens. After removal of the calvaria with an oscillating bone saw, the dura mater was carefully Discussion removed over the cerebral hemispheres. Two distances were 1 measured and all measurements were made with rulers Koperna et al. found that the vein of Labb é may frequently and calipers (Fig. 1). Th e fi rst measurement was the vertical drain into a tentorial sinus; however, this was not observed in distance from the upper edge of the zygomatic arch to the the current study where all veins drained into the transverse drainage site of the vein of Labb é . Th e second measurement sinus. Some of this discrepancy may be explained by the was of the horizontal distance posterior to the opening of the defi nition of a tentorial sinus as used by these prior authors. 8 external auditory meatus to the drainage site of the vein of Han et al. found that the average diameter of the vein of Labb é . Statistical analysis between sides and genders was Labb é was 2.8 mm and that 74% drained into the transverse performed using Statistica for Window and signifi cance was sinus directly. However, 8% travelled through the tentorial set at P Ͻ 0.05. sinuses before entering the transverse sinus, and 9 and 8% For personal use only. Br J Neurosurg Downloaded from informahealthcare.com by St Joseph Hospital on 08/31/14 Fig. 1. Schematic drawing of the measurements made in the current study between the external auditory meatus and zygomatic arch, 152 × 169 mm (300 × 300 DPI). Vein of Labb é 385 drained into the meningeal vein of the occipital dura and this area was, therefore, inconsequential. In addition, there petrosal sinus, respectively. Again, such drainage sites were was no signifi cant diff erence in surgical outcomes between not observed in our specimens. the two groups. 9 Regardless, an improved knowledge of the In regard to the drainage site of the vein, Koperna et al.1 drainage site of this vessel may assist the surgeon in avoid- observed a distance of at least 7 mm between the junctions of ing iatrogenic injury to this venous structure. the vein of Labb é and superior petrosal sinus into the trans- verse sinus. In a study of 40 temporal lobe specimens, Guppy 10 et al. discovered three basic venous confi gurations of the Conclusions vein of Labb é : (1) multiple veins forming a single draining vein; (2) multiple veins that drain independently; and (3) Additional external landmarks for identifying important a venous lake that drains from the tentorium cerebelli. As structures such as the vein of Labb é and its entrance into the mentioned above, other studies have shown that the vein of transverse sinus may aid the neurosurgeon during operative Labb é may on occasion join the tentorial sinus.2 interventions. Our hopes are that the simple superfi cial land- Localizing important cerebral venous structures via marks used in the present study will be useful in localizing superfi cial landmarks is important to the neurosurgeon.
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