scholarly journals Endonasal endoscopic approach for removal of intranasal nasal glial heterotopias

2012 ◽  
Vol 50 (2) ◽  
pp. 211-217
Author(s):  
N.-X. Bonne ◽  
S. Zago ◽  
G. Hosana ◽  
M. Vinchon ◽  
T. Van den Abbeele ◽  
...  
Keyword(s):  
Navigation System ◽  
Endoscopic Approach ◽  
Computer Assisted ◽  
Bony Defect ◽  
Early Management ◽  
Efficient Procedure ◽  
Assisted Navigation ◽  
Endoscopic Techniques ◽  
Congenital Tumours

Background: Nasal Glial Heterotopias also called Nasal Gliomas (NG) are rare congenital tumours of the midline frontonasal space arising from a normal neurectodermal tissue entrapped during the closure of the anterior neuropore. Historically, such tumours were approached using a frontal craniotomy. The study aims to evaluate a fully endonasal endoscopic approach for intranasal NG removal. Methods: We report a retrospective study of intranasal and mixed NG treated using endonasal endoscopic techniques and computer assisted navigation system from 1997 to 2010 in two tertiary referral centres of Paediatric Otolaryngology. All tumours were investigated using two imaging modalities: craniofacial MRI and CT-scan. Results: Fifteen patients were included (0 to 14 years of age). All tumours were totally removed and no recurrence was observed after a mean follow-up of 32 months. A skull base plasty was done in 13 cases to cover a bony defect or to treat a cerebrospinal leak. Nasal packing was usually removed 24 hours after surgery and all children were discharged home after 2 to 4 days. Conclusion: Removal of intranasal NGs using an endonasal endoscopic approach and a dedicated computer assisted navigation system is a safe and efficient procedure. Early management is recommended to treat neonatal airway obstruction.

scholarly journals Stereotactic image‐guided microwave ablation of hepatocellular carcinoma using a computer‐assisted navigation system

2019 ◽  
Vol 39 (10) ◽  
pp. 1975-1985 ◽  
Author(s):  
Anja Lachenmayer ◽  
Pascale Tinguely ◽  
Martin H. Maurer ◽  
Lorenz Frehner ◽  
Marina Knöpfli ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Navigation System ◽  
Microwave Ablation ◽  
Computer Assisted ◽  
Assisted Navigation ◽  
Image Guided

scholarly journals Initial Results of an Acetabular Center Axis Registration Technique in Navigated Hip Arthroplasty with Deformed Acetabular Rims

2016 ◽  
Vol 10 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Hiroshi Wada ◽  
Hajime Mishima ◽  
Tomohiro Yoshizawa ◽  
Hisashi Sugaya ◽  
Tomofumi Nishino ◽  
...  
Keyword(s):  
Hip Arthroplasty ◽  
Navigation System ◽  
Ct Images ◽  
Computer Assisted ◽  
Assisted Navigation ◽  
True Value ◽  
Imageless Navigation ◽  
Acetabular Morphology ◽  
Subcutaneous Tissues ◽  
Center Axis

BackgroundIn cementless total hip arthroplasty, imageless computer-assisted navigation is usually used to register the anterior pelvic plane (APP). The accuracy of this method is influenced by the subcutaneous tissues overlying the registration landmarks. On the other hand, the acetabular center axis (ACA) is determined from the acetabular rim. Precise registration of the ACA is possible because of direct palpation using a pointer. Imageless navigation using the ACA usually targets patients with normal acetabular morphology. The aim of this study was to investigate the accuracy of imageless navigation using the ACA instead of the APP in patients with normal or deformed acetabular rims.MethodsThe intraoperative cup position was compared with that obtained from the postoperative computed tomography (CT) images in 18 cases.ResultsThe inclination angle derived from the navigation system was 3.4 ± 5.3 degrees smaller and the anteversion angle was 1.4 ± 3.1 degrees larger than those derived from the CT images.ConclusionThe inclination cup angle of the navigation system was significantly inferior to the true value, particularly in cases with large anterior osteophytes.

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