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Crama K, Van de Schoot A, Visser J, Bel A. OC-0081: Robust photon versus robust proton therapy planning with a library of plans for cervical cancer. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)31330-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Van der Horst A, Houweling A, Visser J, Van Tienhoven G, Bel A. PO-0899: Robustness of fractionated photon RT for pancreatic cancer: Dosimetric effects of anatomical changes. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32149-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Van Dijk I, Huijskens S, De Jong M, Visser J, Dávila Fajardo R, Rasch C, Alderliesten T, Bel A. OC-0161: Renal and diaphragmatic interfractional motion in children and adults: is there a difference? Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)31410-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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van de Schoot AJAJ, Visser J, van Kesteren Z, Janssen TM, Rasch CRN, Bel A. Beam configuration selection for robust intensity-modulated proton therapy in cervical cancer using Pareto front comparison. Phys Med Biol 2016; 61:1780-94. [PMID: 26854384 DOI: 10.1088/0031-9155/61/4/1780] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The Pareto front reflects the optimal trade-offs between conflicting objectives and can be used to quantify the effect of different beam configurations on plan robustness and dose-volume histogram parameters. Therefore, our aim was to develop and implement a method to automatically approach the Pareto front in robust intensity-modulated proton therapy (IMPT) planning. Additionally, clinically relevant Pareto fronts based on different beam configurations will be derived and compared to enable beam configuration selection in cervical cancer proton therapy. A method to iteratively approach the Pareto front by automatically generating robustly optimized IMPT plans was developed. To verify plan quality, IMPT plans were evaluated on robustness by simulating range and position errors and recalculating the dose. For five retrospectively selected cervical cancer patients, this method was applied for IMPT plans with three different beam configurations using two, three and four beams. 3D Pareto fronts were optimized on target coverage (CTV D(99%)) and OAR doses (rectum V30Gy; bladder V40Gy). Per patient, proportions of non-approved IMPT plans were determined and differences between patient-specific Pareto fronts were quantified in terms of CTV D(99%), rectum V(30Gy) and bladder V(40Gy) to perform beam configuration selection. Per patient and beam configuration, Pareto fronts were successfully sampled based on 200 IMPT plans of which on average 29% were non-approved plans. In all patients, IMPT plans based on the 2-beam set-up were completely dominated by plans with the 3-beam and 4-beam configuration. Compared to the 3-beam set-up, the 4-beam set-up increased the median CTV D(99%) on average by 0.2 Gy and decreased the median rectum V(30Gy) and median bladder V(40Gy) on average by 3.6% and 1.3%, respectively. This study demonstrates a method to automatically derive Pareto fronts in robust IMPT planning. For all patients, the defined four-beam configuration was found optimal in terms of plan robustness, target coverage and OAR sparing.
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Boere KWM, Blokzijl MM, Visser J, Linssen JEA, Malda J, Hennink WE, Vermonden T. Biofabrication of reinforced 3D-scaffolds using two-component hydrogels. J Mater Chem B 2015; 3:9067-9078. [PMID: 32263038 PMCID: PMC7116180 DOI: 10.1039/c5tb01645b] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Progress in biofabrication technologies is mainly hampered by the limited number of suitable hydrogels that can act as bioinks. Here, we present a new bioink for 3D-printing, capable of forming large, highly defined constructs. Hydrogel formulations consisted of a thermoresponsive polymer mixed with a poly(ethylene glycol) (PEG) or a hyaluronic acid (HA) cross-linker with a total polymer concentration of 11.3 and 9.1 wt% respectively. These polymer solutions were partially cross-linked before plotting by a chemoselective reaction called oxo-ester mediated native chemical ligation, yielding printable formulations. Deposition on a heated plate of 37 °C resulted in the stabilization of the construct due to the thermosensitive nature of the hydrogel. Subsequently, further chemical cross-linking of the hydrogel precursors proceeded after extrusion to form mechanically stable hydrogels that exhibited a storage modulus of 9 kPa after 3 hours. Flow and elastic properties of the polymer solutions and hydrogels were analyzed under similar conditions to those used during the 3D-printing process. These experiments showed the ability to extrude the hydrogels, as well as their rapid recovery after applied shear forces. Hydrogels were printed in grid-like structures, hollow cones and a model representing a femoral condyle, with a porosity of 48 ± 2%. Furthermore, an N-hydroxysuccinimide functionalized thermoplastic poly-ε-caprolactone (PCL) derivative was successfully synthesized and 3D-printed. We demonstrated that covalent grafting of the developed hydrogel to the thermoplastic reinforced network resulted in improved mechanical properties and yielded high construct integrity. Reinforced constructs also containing hyaluronic acid showed high cell viability of chondrocytes, underlining their potential for further use in regenerative medicine applications.
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Visser J, Cei J, Gutierrez L. The histology of dermal glands of matingBrevicepswith comments on their possible functional value in microhylids (Amphibia: Anura). ACTA ACUST UNITED AC 2015. [DOI: 10.1080/02541858.1982.11447773] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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82
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Blaauw R, Daniels L, Du Plessis L, Koen N, Koornhof L, Marais M, Nel D, Van Niekerk E, Visser J. MON-PP256: Missed and Used Opportunities in Health Status Assessment of Children. Clin Nutr 2015. [DOI: 10.1016/s0261-5614(15)30688-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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83
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Boere KWM, van den Dikkenberg J, Gao Y, Visser J, Hennink WE, Vermonden T. Thermogelling and Chemoselectively Cross-Linked Hydrogels with Controlled Mechanical Properties and Degradation Behavior. Biomacromolecules 2015; 16:2840-51. [DOI: 10.1021/acs.biomac.5b00802] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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84
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van der Horst A, Houweling AC, Bijveld MMC, Visser J, Bel A. SU-C-210-05: Evaluation of Robustness: Dosimetric Effects of Anatomical Changes During Fractionated Radiation Treatment of Pancreatic Cancer Patients. Med Phys 2015. [DOI: 10.1118/1.4923850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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85
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van den Engh G, Visser J. Flow cytometry in experimental hematology. BIBLIOTHECA HAEMATOLOGICA 2015:42-62. [PMID: 6398065 DOI: 10.1159/000408402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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86
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Van de Schoot A, Visser J, Van Kesteren Z, Janssen T, Rasch C, Bel A. PD-0528: Beam set-up selection using Pareto fronts for robust proton therapy planning in cervical cancer. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40523-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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87
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Huijskens S, Van Dijk I, De Jong M, Visser J, Dávila Fajardo R, Rasch C, Alderliesten T, Bel A. PO-0937: The quantification of renal and diaphragmatic interfraction motion in children. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40929-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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88
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Visser J, Levett PA, te Moller NCR, Besems J, Boere KWM, van Rijen MHP, de Grauw JC, Dhert WJA, van Weeren PR, Malda J. Crosslinkable hydrogels derived from cartilage, meniscus, and tendon tissue. Tissue Eng Part A 2015; 21:1195-206. [PMID: 25557049 DOI: 10.1089/ten.tea.2014.0362] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Decellularized tissues have proven to be versatile matrices for the engineering of tissues and organs. These matrices usually consist of collagens, matrix-specific proteins, and a set of largely undefined growth factors and signaling molecules. Although several decellularized tissues have found their way to clinical applications, their use in the engineering of cartilage tissue has only been explored to a limited extent. We set out to generate hydrogels from several tissue-derived matrices, as hydrogels are the current preferred cell carriers for cartilage repair. Equine cartilage, meniscus, and tendon tissue was harvested, decellularized, enzymatically digested, and functionalized with methacrylamide groups. After photo-cross-linking, these tissue digests were mechanically characterized. Next, gelatin methacrylamide (GelMA) hydrogel was functionalized with these methacrylated tissue digests. Equine chondrocytes and mesenchymal stromal cells (MSCs) (both from three donors) were encapsulated and cultured in vitro up to 6 weeks. Gene expression (COL1A1, COL2A1, ACAN, MMP-3, MMP-13, and MMP-14), cartilage-specific matrix formation, and hydrogel stiffness were analyzed after culture. The cartilage, meniscus, and tendon digests were successfully photo-cross-linked into hydrogels. The addition of the tissue-derived matrices to GelMA affected chondrogenic differentiation of MSCs, although no consequent improvement was demonstrated. For chondrocytes, the tissue-derived matrix gels performed worse compared to GelMA alone. This work demonstrates for the first time that native tissues can be processed into crosslinkable hydrogels for the engineering of tissues. Moreover, the differentiation of encapsulated cells can be influenced in these stable, decellularized matrix hydrogels.
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Gawlitta D, Benders KE, Visser J, van der Sar AS, Kempen DH, Theyse LF, Malda J, Dhert WJ. Decellularized Cartilage-Derived Matrix as Substrate for Endochondral Bone Regeneration. Tissue Eng Part A 2015; 21:694-703. [DOI: 10.1089/ten.tea.2014.0117] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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de Windt TS, Vonk LA, Buskermolen JK, Visser J, Karperien M, Bleys RLAW, Dhert WJA, Saris DBF. Arthroscopic airbrush assisted cell implantation for cartilage repair in the knee: a controlled laboratory and human cadaveric study. Osteoarthritis Cartilage 2015; 23:143-50. [PMID: 25241243 DOI: 10.1016/j.joca.2014.09.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 09/04/2014] [Accepted: 09/05/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The objective of this study was to investigate the feasibility of arthroscopic airbrush assisted cartilage repair. METHODS An airbrush device (Baxter) was used to spray both human expanded osteoarthritic chondrocytes and choncrocytes with their pericellular matrix (chondrons) at 1 × 10(6) cells/ml fibrin glue (Tissucol, Baxter) in vitro. Depth-dependent cell viability was assessed for both methods with confocal microscopy. Constructs were cultured for 21 days to assess matrix production. A controlled human cadaveric study (n = 8) was performed to test the feasibility of the procedure in which defects were filled with either arthroscopic airbrushing or needle extrusion. All knees were subjected to 60 min of continuous passive motion and scored on outline attachment and defect filling. RESULTS Spraying both chondrocytes and chondrons in fibrin glue resulted in a homogenous cell distribution throughout the scaffold. No difference in viability or matrix production between application methods was found nor between chondrons and chondrocytes. The cadaveric study revealed that airbrushing was highly feasible, and that defect filling through needle extrusion was more difficult to perform based on fibrin glue adhesion and gravity-induced seepage. Defect outline and coverage scores were consistently higher for extrusion, albeit not statistically significant. CONCLUSION Both chondrons and chondrocytes can be evenly distributed in a sprayed fibrin glue scaffold without affecting viability while supporting matrix production. The airbrush technology is feasible, easier to perform than needle extrusion and allows for reproducible arthroscopic filling of cartilage defects.
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Visser J, Gawlitta D, Benders KEM, Toma SMH, Pouran B, van Weeren PR, Dhert WJA, Malda J. Endochondral bone formation in gelatin methacrylamide hydrogel with embedded cartilage-derived matrix particles. Biomaterials 2014; 37:174-82. [PMID: 25453948 DOI: 10.1016/j.biomaterials.2014.10.020] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 10/02/2014] [Indexed: 12/26/2022]
Abstract
The natural process of endochondral bone formation in the growing skeletal system is increasingly inspiring the field of bone tissue engineering. However, in order to create relevant-size bone grafts, a cell carrier is required that ensures a high diffusion rate and facilitates matrix formation, balanced by its degradation. Therefore, we set out to engineer endochondral bone in gelatin methacrylamide (GelMA) hydrogels with embedded multipotent stromal cells (MSCs) and cartilage-derived matrix (CDM) particles. CDM particles were found to stimulate the formation of a cartilage template by MSCs in the GelMA hydrogel in vitro. In a subcutaneous rat model, this template was subsequently remodeled into mineralized bone tissue, including bone-marrow cavities. The GelMA was almost fully degraded during this process. There was no significant difference in the degree of calcification in GelMA with or without CDM particles: 42.5 ± 2.5% vs. 39.5 ± 8.3% (mean ± standard deviation), respectively. Interestingly, in an osteochondral setting, the presence of chondrocytes in one half of the constructs fully impeded bone formation in the other half by MSCs. This work offers a new avenue for the engineering of relevant-size bone grafts, by the formation of endochondral bone within a degradable hydrogel.
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Stevenson C, Blaauw R, Fredericks E, Visser J, Roux S. PP137-SUN: Randomized Clinical Trial: Effect of Lactobacillus Plantarum 299V on Symptoms of Irritable Bowel Syndrome. Clin Nutr 2014. [DOI: 10.1016/s0261-5614(14)50179-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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93
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Visser J, Rasch C, Hulshof M, Bel A. Robust Proton Versus Photon Dose Escalated Chemoradiation as Primary Treatment for Esophageal Cancer. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Levato R, Visser J, Planell JA, Engel E, Malda J, Mateos-Timoneda MA. Biofabrication of tissue constructs by 3D bioprinting of cell-laden microcarriers. Biofabrication 2014; 6:035020. [PMID: 25048797 DOI: 10.1088/1758-5082/6/3/035020] [Citation(s) in RCA: 233] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Bioprinting allows the fabrication of living constructs with custom-made architectures by spatially controlled deposition of multiple bioinks. This is important for the generation of tissue, such as osteochondral tissue, which displays a zonal composition in the cartilage domain supported by the underlying subchondral bone. Challenges in fabricating functional grafts of clinically relevant size include the incorporation of cues to guide specific cell differentiation and the generation of sufficient cells, which is hard to obtain with conventional cell culture techniques. A novel strategy to address these demands is to combine bioprinting with microcarrier technology. This technology allows for the extensive expansion of cells, while they form multi-cellular aggregates, and their phenotype can be controlled. In this work, living constructs were fabricated via bioprinting of cell-laden microcarriers. Mesenchymal stromal cell (MSC)-laden polylactic acid microcarriers, obtained via static culture or spinner flask expansion, were encapsulated in gelatin methacrylamide-gellan gum bioinks, and the printability of the composite material was studied. This bioprinting approach allowed for the fabrication of constructs with high cell concentration and viability. Microcarrier encapsulation improved the compressive modulus of the hydrogel constructs, facilitated cell adhesion, and supported osteogenic differentiation and bone matrix deposition by MSCs. Bilayered osteochondral models were fabricated using microcarrier-laden bioink for the bone compartment. These findings underscore the potential of this new microcarrier-based biofabrication approach for bone and osteochondral constructs.
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Boere KWM, Visser J, Seyednejad H, Rahimian S, Gawlitta D, van Steenbergen MJ, Dhert WJA, Hennink WE, Vermonden T, Malda J. Covalent attachment of a three-dimensionally printed thermoplast to a gelatin hydrogel for mechanically enhanced cartilage constructs. Acta Biomater 2014; 10:2602-11. [PMID: 24590160 DOI: 10.1016/j.actbio.2014.02.041] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Revised: 01/23/2014] [Accepted: 02/21/2014] [Indexed: 01/01/2023]
Abstract
Hydrogels can provide a suitable environment for tissue formation by embedded cells, which makes them suitable for applications in regenerative medicine. However, hydrogels possess only limited mechanical strength, and must therefore be reinforced for applications in load-bearing conditions. In most approaches the reinforcing component and the hydrogel network have poor interactions and the synergetic effect of both materials on the mechanical properties is not effective. Therefore, in the present study, a thermoplastic polymer blend of poly(hydroxymethylglycolide-co-ε-caprolactone)/poly(ε-caprolactone) (pHMGCL/PCL) was functionalized with methacrylate groups (pMHMGCL/PCL) and covalently grafted to gelatin methacrylamide (gelMA) hydrogel through photopolymerization. The grafting resulted in an at least fivefold increase in interface-binding strength between the hydrogel and the thermoplastic polymer material. GelMA constructs were reinforced with three-dimensionally printed pHMGCL/PCL and pMHMGCL/PCL scaffolds and tested in a model for a focal articular cartilage defect. In this model, covalent bonds at the interface of the two materials resulted in constructs with an improved resistance to repeated axial and rotational forces. Moreover, chondrocytes embedded within the constructs were able to form cartilage-specific matrix both in vitro and in vivo. Thus, by grafting the interface of different materials, stronger hybrid cartilage constructs can be engineered.
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Salem KMI, Visser J, Quraishi NA. Trans-oral approach for the management of a C2 neuroblastoma. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2014; 24:170-6. [PMID: 24549386 DOI: 10.1007/s00586-014-3216-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 01/19/2014] [Accepted: 01/23/2014] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Neuroblastoma is the most common extra-cranial solid tumour in children. Metastasis in children to the upper cervical spine are quite rare. CASE REPORT An 8-year-old boy was referred to our service following a relapse of a right adrenal stage 4 neuroblastoma with a metastatic deposit in C2. This anterior tumour mass was pressing on the spinal cord with increasing pain in the base of skull, but without gross neurological deficit. He underwent urgent MRI and CT scans and then emergent surgery. The first stage was a posterior stabilization from occiput to C5 with a posterior decompression from C1 to C3 followed by a trans-oral approach to resect the main anterior tumour mass and reconstruction. CONCLUSION This is the first report of the use of a trans-oral approach to address a neuroblastoma lesion in the axial spine. This approach was used effectively to achieve local tumour clearance confirmed at 1-year follow-up. Pertinent information to the spinal surgeon on neuroblastoma and the use of the trans-oral approach to the axial spine are discussed.
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Ghazanfari N, Van Goethem MJ, Van Beuzekom M, Klaver T, Visser J, Brandenburg S, Biegun A. Proton radiography imaging tool to improve a proton therapy treatment. Phys Med 2014. [DOI: 10.1016/j.ejmp.2014.07.088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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98
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Lutkenhaus L, Visser J, Hulshof M, De Jong M, Hazelaar C, Bel A. PO-0883: Dosimetric evaluation of four patients treated with adaptive radiotherapy for bladder cancer. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)31001-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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99
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Van Wieringen N, Silveira S, Vugts C, Visser J, Houweling A, Bel A. EP-1675: Dose calculation on CBCT: A simple approach accounting for the dependency of grey values on cone beam scan parameters. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)31793-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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100
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Lombard LA, du Plessis LM, Visser J. Body composition of rheumatoid arthritis patients in the City of Cape Town, South Africa. Clin Rheumatol 2013; 33:467-76. [DOI: 10.1007/s10067-013-2414-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 07/16/2013] [Accepted: 10/18/2013] [Indexed: 11/24/2022]
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