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Yoshida K, Niimi Y, Kamamoto D, Fukumura M, Imai R, Nagoshi N, Akiyama T. Targeted embolisation for coexisting conus medullaris arteriovenous malformation and cauda equina arteriovenous fistulas with a varix on a shared drainer †. Br J Neurosurg 2023; 37:1200-1205. [PMID: 33034527 DOI: 10.1080/02688697.2020.1830948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 09/28/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND The coexistence of vascular malformations in the conus medullaris and cauda equina has been rarely reported, and the complex angioarchitecture in multiple arteriovenous lesions remains poorly understood. CASE DESCRIPTION A 17-year-old woman presented with a sudden-onset, stepwise worsening of weakness and pain in the bilateral legs. Angiography revealed conus medullaris arteriovenous malformation and cauda equina arteriovenous fistulas. One of the drainers was shared between the coexisting lesions and harboured a varix. Targeted embolisation of a fistulous point in the conus lesion was performed with precaution to prevent occluding the common drainage route, which led to symptom improvement with angiographical diminishment of the varix. CONCLUSIONS Recognising that communications between drainers can be observed in multiple spinal arteriovenous lesions is important in facilitating a safe embolisation. Cautious assessment of angiogram with fusion images of cone-beam computed tomography and volumetric T2 magnetic resonance imaging can help in establishing the diagnosis and treatment strategy.
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Affiliation(s)
- Keisuke Yoshida
- Department of Neurosurgery, Keio University School of Medicine, Tokyo, Japan
| | - Yasunari Niimi
- Department of Neuroendovascular Therapy, St. Luke's International Hospital, Tokyo, Japan
| | - Dai Kamamoto
- Department of Neurosurgery, Keio University School of Medicine, Tokyo, Japan
| | - Mariko Fukumura
- Department of Neurosurgery, Keio University School of Medicine, Tokyo, Japan
| | - Ryotaro Imai
- Department of Neurosurgery, Keio University School of Medicine, Tokyo, Japan
| | - Narihito Nagoshi
- Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan
| | - Takenori Akiyama
- Department of Neurosurgery, Keio University School of Medicine, Tokyo, Japan
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Giustiniano E, Nisi F, Palma S, Pisciotta W, Ruggieri N, Barbieri F, Civilini E, Maurizio C. Near-infrared spectroscopy to monitor spinal cord oxygenation in οpen thoraco-abdominal aortic surgery. A case series. HELLENIC JOURNAL OF VASCULAR AND ENDOVASCULAR SURGERY 2022:111-119. [DOI: 10.59037/hjves.v4i4.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Objectives. We adopted the near-infrared spectroscopy (NIRS) technology to monitor the spinal oxygen supply through the paraspinous muscles oxygenation in agreement with the concept of “collateral network” circulation. We retrospectively investigated our database of subjects who underwent thoraco-abdominal aorta open repair assessing for the reliability of this monitoring to predict spinal cord injury.
Methods. Consecutive patients who underwent elective thoraco-abdominal aorta open repair between March 2019
and September 2021. In addition to standard monitoring, patients received the monitoring of the paraspinous muscles
oxygenation by NIRS.
Results. In one patient a significant drop of the mean arterial pressure (49 mmHg) and the spinal-cord perfusion pressure
(31 mmHg) occurred after the aortic clamping, with a contemporary lowering of the left-side oxygenation of paraspinous muscles (<40%). Both the blood pressure and the spinal cord perfusion pressure were restored within 10 minutes, but the oxygenation remained at an unsafe level (<55%) until the end of the surgery. This same patient experienced a lower-limb paralysis post-operatively. It did not happen in the other 11 cases of the sample.
Conclusions. The main finding of our retrospective analysis indicates reliability of this technology to monitor the spinal
cord oxygenation during open thoraco-abdominal aortic surgery and possibly predict spinal cord injury. Still, several
questions need to be addressed about the suitability of this technology to the anatomic and pathophysiology of the
spinal cord circulation
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Affiliation(s)
- Enrico Giustiniano
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Rozzano (MI), Italy
| | - Fulvio Nisi
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Rozzano (MI), Italy
| | - Sergio Palma
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Rozzano (MI), Italy
| | - Walter Pisciotta
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Rozzano (MI), Italy
| | - Nadia Ruggieri
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Rozzano (MI), Italy
| | - Francesca Barbieri
- Vascular Surgery Unit, IRCCS Humanitas Research Hospital, Rozzano (MI), Italy
| | - Efrem Civilini
- Vascular Surgery Unit, IRCCS Humanitas Research Hospital, Rozzano (MI), Italy; Department of Biomedical Sciences, Humanitas University, Pieve Emanuele (MI), Italy
| | - Cecconi Maurizio
- Department of Anesthesia and Intensive Care Units, IRCCS Humanitas Research Hospital, Rozzano (MI), Italy; Department of Biomedical Sciences, Humanitas University, Pieve Emanuele (MI), Italy
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Feldman KM, O'Keefe YA, Gignac PM, O'Brien HD. Highest resolution microCT scan of the human brainstem reveals putative anatomical basis for infrequency of medial medullary syndrome. Neuroimage Clin 2022; 36:103272. [PMID: 36451373 PMCID: PMC9723294 DOI: 10.1016/j.nicl.2022.103272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 11/01/2022] [Accepted: 11/17/2022] [Indexed: 11/19/2022]
Abstract
Ischemic strokes affecting the medial medulla are exceedingly rare. The anatomical basis for the relative infrequency of this stroke syndrome has been largely uninvestigated due to historically coarse MRI and CT scan resolution. We capture and digitally dissect the highest-ever-resolution diffusible iodine-based contrast-enhanced CT (diceCT) scanned images of a cadaveric brainstem to map arterial territories implicated in medial medullary infarctions. 3D reconstructions show that within the anterior spinal artery territory previously implicated in medial medullary syndrome (MMS), there are numerous, small sulcal artery branches perforating the medulla within the anterior median fissure. These branches proceed in parallel through the anteroposterior depth of the medulla as expected; however, we also identify a network of intraparenchymal, rostrocaudal anastomoses between these sulcal perforating branches. This network of intraparenchymal sulcal artery anastomoses has never been described and may provide a significant collateral supply of oxygenated blood flow throughout the medial medulla. By ramifying deeper tissues, these anastomoses can help explain the infrequency of MMS.
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Affiliation(s)
- Kaylea M. Feldman
- Oklahoma State University Center for Health Sciences, Department of Anatomy and Cell Biology, 1111 W 17th Street, Tulsa, OK 74107, USA,Corresponding authors at: 1501 N. Campbell Avenue, PO Box 245044, Tucson, AZ 85724-5044, USA (H. O’Brien).
| | - Yasmin A. O'Keefe
- Ascension St. John Medical Center, Department of Neurology/Neurocritical Care, 2100 S Wheeling Ave, Tulsa, OK 74104, USA
| | - Paul M. Gignac
- Oklahoma State University Center for Health Sciences, Department of Anatomy and Cell Biology, 1111 W 17th Street, Tulsa, OK 74107, USA,University of Arizona, Department of Cellular and Molecular Medicine, 1501 N. Campbell Avenue, PO Box 245044, Tucson, AZ 85724, USA
| | - Haley D. O'Brien
- Oklahoma State University Center for Health Sciences, Department of Anatomy and Cell Biology, 1111 W 17th Street, Tulsa, OK 74107, USA,University of Arizona, Department of Cellular and Molecular Medicine, 1501 N. Campbell Avenue, PO Box 245044, Tucson, AZ 85724, USA,Corresponding authors at: 1501 N. Campbell Avenue, PO Box 245044, Tucson, AZ 85724-5044, USA (H. O’Brien).
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Rojas S, Ortega M, Rodríguez-Baeza A. Anatomical study of the pial arterial network in human spinal cords. Clin Anat 2020; 34:596-604. [PMID: 32427384 DOI: 10.1002/ca.23622] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/10/2020] [Accepted: 05/10/2020] [Indexed: 11/09/2022]
Abstract
INTRODUCTION Multiple collaterals originate from three main longitudinal vessels to perfuse the human spinal cord. Only a few classic studies published in the last century have investigated these collaterals. The current work proposes a possible classification of these vessels and analyzes their relative abundance along spinal cord segments. MATERIALS AND METHODS Human spinal cords (n = 30) from male and female cadavers were injected with colored latex through the vertebral, ascending cervical, costocervical trunk and segmental arteries and then fixed in formaldehyde solution. Afterwards, spinal vessels were dissected and the relative abundances of each type of collateral were quantified and compared between different spinal cord segments. RESULTS Collaterals of the anterior longitudinal pathway can be classified as central arteries and arteries for the anterior and lateral columns. Collaterals for the anterior column can be classified into two types: anteromedial and anterolateral. Arteries for the lateral column can be classified, according to their relationship with the dentate ligament, as either preligamentous or post-ligamentous. The collaterals of posterior longitudinal pathways can be divided between those for the posterior and those for the lateral column. In turn, the arteries for the posterior column can be classified into three types: median posterior, posteromedial and posterolateral. The collaterals for the lateral column were also classified as either pre- or post-ligamentous. CONCLUSION The relative abundance of the various types of collateral and anastomoses between longitudinal pathways was inhomogeneous along the spinal cord, with several statistically significant differences observed between spinal segments.
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Affiliation(s)
- Santiago Rojas
- Unit of Human Anatomy and Embriology, Department of Morphological Sciences, Faculty of Medicine, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain.,Serra Húnter Fellow, Universtitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
| | - Marisa Ortega
- Unit of Human Anatomy and Embriology, Department of Morphological Sciences, Faculty of Medicine, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain.,Institute of Legal Medicine and Forensic Sciences of Catalonia, Hospitalet de Llobregat, Spain
| | - Alfonso Rodríguez-Baeza
- Unit of Human Anatomy and Embriology, Department of Morphological Sciences, Faculty of Medicine, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
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Venous Drainage of Lumbar Vertebral Bodies: Anatomic Study with Application to Kyphoplasty, Vertebroplasty, and Pedicle Screw Complications. World Neurosurg 2020; 137:e286-e290. [PMID: 32014549 DOI: 10.1016/j.wneu.2020.01.174] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 01/21/2020] [Accepted: 01/22/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Bone cement augmentation with polymethylmethacrylate is a reliable method for stabilizing osteoporotic compression fractures and improving fixation of pedicle screws. However, cement extrusion into the vertebral venous system can result in pulmonary cement embolism. The goal of this anatomic study was to identify the relationship between the internal/external vertebral plexus and neighboring abdominal caval system. METHODS Thirty-two lumbar vertebral levels were used in this study. Anterior abdominal dissection was performed to access the lumbar vertebral bodies through the peritoneal cavity, and a 16-gauge needle was placed into the center of each lumbar vertebral body at its anterior aspect. Fluoroscopy was used to confirm if the needle was correctly placed. Next, latex and/or continuous air injections were performed into each lumbar vertebral level (L1-L5). Observations confirmed if the latex or air traveled into the inferior vena cava. In addition, the spinal canal was opened to see if any latex was found to enter inside the vertebral canal in cadavers injected with the latex. RESULTS Latex or air was found to flow into the inferior vena cava at all the lumbar vertebral levels. The latex/air was not observed in the spinal canal in any specimen. CONCLUSIONS An exact knowledge of the lumbar vertebral venous anatomy is essential when procedures that could affect the vertebral venous system are involved. Its complexity and anatomic variability necessitate such an understanding to better prevent/understand possible complications associated with polymethylmethacrylate extrusion.
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Perez Perez VH, Hernesniemi J, Small JE. Anatomy of the Great Posterior Radiculomedullary Artery. AJNR Am J Neuroradiol 2019; 40:2010-2015. [PMID: 31753838 PMCID: PMC6975349 DOI: 10.3174/ajnr.a6304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 09/19/2019] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Although considerable variability exists as to the overall caliber of radiculomedullary arteries, dominant radiculomedullary arteries such as the artery of Adamkiewicz exist. The existence of a great posterior radiculomedullary artery has attracted little attention and has been a matter of debate. The aim of this anatomic study was to determine the presence or absence of the great posterior radiculomedullary artery. MATERIALS AND METHODS We performed microsurgical dissection on formaldehyde-fixed cadaveric human spinal cords. The artery of Adamkiewicz in the spinal cord specimens (n = 50) was injected with colored latex until the small-caliber arterial vessels were filled and the great posterior radiculomedullary artery was identified. The course, diameter, and location of great posterior radiculomedullary artery were documented. RESULTS A great posterior radiculomedullary artery was identified in 36 (72%) spinal cord specimens. In 11 (22%) specimens, bilateral great posterior radiculomedullary arteries were present. In 13 cases (26%), a unilateral left-sided great posterior radiculomedullary artery was identified. In 11 cases (22%), a unilateral right-sided great posterior radiculomedullary artery was identified. In 1 specimen (2%), 3 right-sided great posterior radiculomedullary arteries were noted. The average size of the great posterior radiculomedullary arteries was 0.44 mm (range, 0.120-0.678 mm on the left and 0.260-0.635 mm on the right). CONCLUSIONS A great posterior radiculomedullary artery is present in most (72%) individuals. The authors describe the microsurgical anatomy of the great posterior radiculomedullary artery with emphasis on its morphometric parameters as well as its implications for spinal cord blood supply. Variations of the arterial supply to the dorsal cord are of great importance due to their implications for ischemic events, endovascular procedures, and surgical approaches.
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Affiliation(s)
- V H Perez Perez
- From the Department of Neurosurgery (V.H.P.P.), Instituto de Ciencias Forenses, TSJ Ciudad de México, Centro Medico Siglo XXI, Mexico City, Mexico
| | - J Hernesniemi
- Department of Neurosurgery (H.J.), International Center for Neurosurgery, Henan Provincial People's Hospital, Zhengzhou, China
| | - J E Small
- Department of Radiology (J.E.S.), Neuroradiology Section, Lahey Hospital and Medical Center, Burlington, Massachusetts.
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Patel M, Vetter M, Simonds E, Schumacher M, Laws T, Iwanaga J, Oskouian R, Tubbs RS. Mechanical relationship of filum terminale externum and filum terminale internum: is it possible to detether the spinal cord extradurally? Childs Nerv Syst 2018; 34:1767-1770. [PMID: 29797063 DOI: 10.1007/s00381-018-3837-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 05/13/2018] [Indexed: 11/25/2022]
Abstract
INTRODUCTION Intradural transection of the filum terminale (FTI) is often used to treat tethered cord syndrome. Recently, some have proposed that the extradural part of the filum terminale (FTE) can be sectioned with equal results but with fewer complications. Therefore, the present cadaveric study aimed to evaluate the anatomical foundation of such procedures. METHODS A posterior lumbosacral approach was performed on five fresh-frozen cadaveric specimens to expose both the FTI and FTE. Tension was then applied to the FTE and observations and measurements made of any movement of the FTI. Other morphological measurements (e.g., length, diameter) of the FTI and FTE were also made. RESULTS Although very minimal movement of the FTI was seen in the majority of specimens following tension on the FTE, no specimen was found to have more cranial movement of the conus medullaris or cauda equina. The mean length and diameter of the FTI was 52.2 and 0.38 mm, respectively. The mean length and diameter of the FTE was 77 and 0.60 mm, respectively. The force necessary to move the FTI with tension applied to the FTE had a mean of 0.03 N. The average distance that the FTI moved with distal FTE tension was 1.33 mm. All specimens had a thecal sac that terminated at the S2 vertebral level. And no specimen had a low-lying conus medullaris, cutaneous stigmata of occult spinal dysraphism, or grossly visible adipose tissue in either the FTI or FTE. CONCLUSIONS Based on our studies, tension placed on the FTE has very little effect on the FTI and no obvious effect on the conus medullaris or cauda equina. Therefore, isolated transection of the FTE for a patient with tethered cord syndrome is unlikely to have significant effect. To our knowledge, this is the first study to quantitate the distal forces needed on the FTE to move the FTI.
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Affiliation(s)
- Mayank Patel
- Seattle Science Foundation, 550 17th Ave, James Tower, Suite 600, Seattle, WA, 98122, USA
| | - Marc Vetter
- Seattle Science Foundation, 550 17th Ave, James Tower, Suite 600, Seattle, WA, 98122, USA
| | - Emily Simonds
- Seattle Science Foundation, 550 17th Ave, James Tower, Suite 600, Seattle, WA, 98122, USA
| | - Maia Schumacher
- Seattle Science Foundation, 550 17th Ave, James Tower, Suite 600, Seattle, WA, 98122, USA
| | - Tyler Laws
- Seattle Science Foundation, 550 17th Ave, James Tower, Suite 600, Seattle, WA, 98122, USA
| | - Joe Iwanaga
- Seattle Science Foundation, 550 17th Ave, James Tower, Suite 600, Seattle, WA, 98122, USA
| | - Rod Oskouian
- Seattle Science Foundation, 550 17th Ave, James Tower, Suite 600, Seattle, WA, 98122, USA
| | - R Shane Tubbs
- Seattle Science Foundation, 550 17th Ave, James Tower, Suite 600, Seattle, WA, 98122, USA.
- Department of Anatomical Sciences, St. George's University, St. George's, Grenada.
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