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• Corniola, Marco V.; Lobrinus, Johannes; Lemée, Jean-Michel & Meling, Torstein Ragnar (2020). Méningiomes intracrâniens - Prise en charge des patients à l’ère microchirurgicale. Revue Medicale Suisse.  ISSN 1660-9379.  16(680), s 283- 288
• Corniola, Marco Vincenzo; Meling, Torstein Ragnar; Bijlenga, Philippe; Bernava, Gianmarco; Machi, Paolo & Schaller, Karl (2020). Posterior fossa arteriovenous malformations– experience with 14 patients and review of the literature. Central European Neurosurgery.  ISSN 2193-6315.  81(02), s 170- 176 . doi: 10.1055/s-0039-1691820
• Hosainey, Sayied Abdol Mohieb; Lassen, Benjamin; Hald, John K; Helseth, Eirik & Meling, Torstein Ragnar (2020). The effect of tumor removal via craniotomies on preoperative hydrocephalus in adult patients with intracranial tumors. Neurosurgical review.  ISSN 0344-5607.  43(1), s 141- 151 . doi: 10.1007/s10143-018-1021-6
• Jeanmougin, Marine; Håvik, Annette Bentsen; Cekaite, Lina; Brandal, Petter; Sveen, Anita; Meling, Torstein Ragnar; Ågesen, Trude Holmeide; Scheie, David; Heim, Sverre; Lothe, Ragnhild A & Lind, Guro Elisabeth (2020). Improved prognostication of glioblastoma beyond molecular subtyping by transcriptional profiling of the tumor microenvironment. Molecular Oncology.  ISSN 1574-7891.  s 1016- 1027 . doi: 10.1002/1878-0261.12668
• König, Marton; Osnes, Terje; Bruland, Øyvind; Hall, Kirsten Sundby; Bratland, Åse & Meling, Torstein Ragnar (2020). The role of adjuvant treatment in craniofacial malignancy: A critical review. Frontiers in Oncology.  ISSN 2234-943X. . doi: 10.3389/fonc.2020.01402
• Larsson, Christopher; Groote, Inge Rasmus; Vardal, Jonas; Kleppestø, Magne Mørk; Odland, Audun; Brandal, Petter; Due-Tønnessen, Paulina; Holme, Sigrun Skaar; Hope, Tuva Roaldsdatter; Meling, Torstein Ragnar; Fosse, Erik; Emblem, Kyrre E & Bjørnerud, Atle (2020). Prediction of survival and progression in glioblastoma patients using temporal perfusion changes during radiochemotherapy. Magnetic Resonance Imaging.  ISSN 0730-725X.  68, s 106- 112 . doi: 10.1016/j.mri.2020.01.012 Fulltekst i vitenarkiv.
• Lemée, Jean-Michel; Corniola, Marco V. & Meling, Torstein Ragnar (2020). Benefits of re-do surgery for recurrent intracranial meningiomas. Scientific Reports.  ISSN 2045-2322.  10(1) . doi: 10.1038/s41598-019-57254-5 Fulltekst i vitenarkiv.
• Llorens, Anaïs; Funderud, Ingrid; Blenkmann, Alejandro Omar; Lubell, James; Foldal, Maja Dyhre; Leske, Sabine Liliana; Huster, Rene; Meling, Torstein Ragnar; Knight, Robert T; Solbakk, Anne-Kristin & Endestad, Tor (2020). Preservation of Interference Effects in Working Memory After Orbitofrontal Damage. Frontiers in Human Neuroscience.  ISSN 1662-5161.  13 . doi: https://doi.org/10.3389/fnhum.2019.00445 Fulltekst i vitenarkiv.
• Meling, Torstein Ragnar & Patet, Gildas (2020). The role of EC-IC bypass in ICA blood blister aneurysms - a systematic review. Neurosurgical review.  ISSN 0344-5607.  s 1- 10 . doi: 10.1007/s10143-020-01302-6 Fulltekst i vitenarkiv.
• Meling, Trym R. & Meling, Torstein Ragnar (2020). The impact of surgical simulation on patient outcomes: a systematic review and meta-analysis. Neurosurgical review.  ISSN 0344-5607.  s 1- 12 . doi: 10.1007/s10143-020-01314-2
• Álvarez-Torres, Maria del Mar; Juan-Albarracín, Javier; Fuster i Garcia, Elies; Bellvís-Bataller, Fuensanta; Lorente, David; Reynés, Gaspar; Font de Mora, Jaime; Aparici-Robles, Fernando; Botella, Carlos; Muñoz-Langa, Jose; Faubel, Raquel; Asensio-Cuesta, Sabina; García-Ferrando, Gérman A.; Chelebian, Eduard; Auger, Cristina; Pineda, Jose; Rovira, Alex; Oleaga, Laura; Mollà-Olmos, Enrique; Revert, Antonio J.; Tshibanda, Luaba; Crisi, Girolamo; Emblem, Kyrre E; Martin, Didier; Due-Tønnessen, Paulina; Meling, Torstein Ragnar; Filice, Silvano; Sáez, Carlos & García-Gómez, Juan M. (2019). Robust association between vascular habitats and patient prognosis in glioblastoma: An international multicenter study. Journal of Magnetic Resonance Imaging.  ISSN 1053-1807.  s 1- 9 . doi: 10.1002/jmri.26958
• Blenkmann, Alejandro Omar; Collavini, Santiago; Lubell, James; Anais, Llorens; Funderud, Ingrid; Ivanovic, Jugoslav; Larsson, Pål Gunnar; Meling, Torstein Ragnar; Bekinschtein, Tristan; Kochen, Silvia; Endestad, Tor; Knight, Robert T & Solbakk, Anne-Kristin (2019). Auditory deviance detection in the human insula: An intracranial EEG study. Cortex.  ISSN 0010-9452.  121, s 189- 200 . doi: 10.1016/j.cortex.2019.09.002 Fulltekst i vitenarkiv.
• Corniola, Marco V.; Lemee, Jean-Michel; Broi, Michele Da; Joswig, Holger; Schaller, Karl; Helseth, Eirik & Meling, Torstein Ragnar (2019). Posterior fossa meningiomas: perioperative predictors of extent of resection, overall survival and progression-free survival. Acta Neurochirurgica.  ISSN 0001-6268.  161(5), s 1003- 1011 . doi: 10.1007/s00701-019-03862-z
• Corniola, Marco V.; Lemée, Jean-Michel; Schaller, Karl & Meling, Torstein Ragnar (2019). Lateral sphenoid wing meningiomas without bone invasion-still skull base surgery?. Neurosurgical review.  ISSN 0344-5607.  s 1- 7 . doi: 10.1007/s10143-019-01181-6
• König, Marton; Osnes, Terje; Bratland, Åse; Jebsen, Peter Wilhelm & Meling, Torstein Ragnar (2019). Treatment of Sinonasal Adenocarcinoma: A Population-Based Prospective Cohort Study. Journal of Neurological Surgery. Part B: Skull Base: an interdisciplinary approach.  ISSN 2193-6331. . doi: 10.1055/s-0039-1694050 Fulltekst i vitenarkiv.
• König, Marton; Osnes, Terje; Bratland, Åse & Meling, Torstein Ragnar (2019). Squamous Cell Carcinoma of the Paranasal Sinuses: A Single Center Experience. Journal of Neurological Surgery. Part B: Skull Base: an interdisciplinary approach.  ISSN 2193-6331. . doi: 10.1055/s-0039-1694967 Fulltekst i vitenarkiv.
• Lemee, Jean-Michel; Corniola, Marco V.; Broi, Michele Da; Joswig, Holger; Scheie, David; Schaller, Karl; Helseth, Eirik & Meling, Torstein Ragnar (2019). Extent of Resection in Meningioma: Predictive Factors and Clinical Implications. Scientific Reports.  ISSN 2045-2322.  9(1), s 1- 6 . doi: 10.1038/s41598-019-42451-z Fulltekst i vitenarkiv. Vis sammendrag

  Meningiomas present as intracranial extra-axial lesions with dural attachment, which are primarily managed surgically. The extent of resection (EOR) may vary depending on patient- and tumor-related factors. The aim of this study is to identify preoperative predictive factors of EOR and to propose an estimation of the predicted gross total resection (GTR) based of patient- and tumor-characteristics. 1469 patients from a retrospectively (1990 to 2002) and prospectively managed (2003 to 2010) databank of Oslo University Hospital, Norway, totalling 11,414 patient-years of follow-up were included. Patients had a mean age at surgery of 64 ± 20.1 years with a female-to-male ratio was 2.4:1 and a mean KPS of 81.2 ± 12.1. Skull-base meningiomas represented 47% of all cases. WHO grades were I in 92.3%, II in 5.2%, and III in 2.2%. Bone infiltration was described in 18.7% of cases. 39.3% of patients had Simpson I resection, 34.3% had Simpson II, 5.4% had Simpson III, 20.6% had Simpson IV, and 0.5% had Simpson V. The risk factors for incomplete resection were: symptomatic presentation (OR 0.56 [0.43–0.72]), skull-base location (OR 0.79 [0.70–0.88]), and bone invasion (OR 0.85 [0.73–0.99]). Using a recursive partitioning analysis, we propose a classification-tree for the prediction of GTR rate based on preoperatively determinable patient- and tumor characteristics. The identification of preoperative predictors of poor GTR rate may aid clinicians managing meningioma patients. In selected cases were the predicted GTR rate is low, staged treatment with surgical debulking followed by adjuvant therapy may be favored in order to minimize postoperative morbidity and mortality.

• Lemee, Jean-Michel; Corniola, Marco V.; Broi, Michele Da; Schaller, Karl & Meling, Torstein Ragnar (2019). Early Postoperative Complications in Meningioma: Predictive Factors and Impact on Outcome. World Neurosurgery.  ISSN 1878-8750.  128, s 851- 858 . doi: 10.1016/j.wneu.2019.05.010 Vis sammendrag

  Background Craniotomies carry inherent risks of postoperative complications that may have a negative impact on patients' status. Recognizing and preventing surgical complications is of paramount importance, especially in meningioma surgery, where most of these tumors are benign and current management protocols are effective in terms of disease control and maintenance of higher quality of life. The objective of this study was to describe the early complications after surgery and their predictive factors in patients undergoing resection of intracranial meningiomas. Methods A partly retrospective, partly prospective review was conducted in a Norwegian population-based cohort of 1469 consecutive cases of meningioma surgery treated at the university hospitals of Oslo, totaling 11,414 patient-years of follow-up. Results 2.6% of patients had a postoperative hematoma, 2.7% a postoperative infection, 3.9% a postoperative worsening of neurologic status; 5.4% of patients died during a 30-day period after surgery. Predictive factors of increased risk of postoperative complications were patient's age for the hematoma, a non–skull base meningioma for infection, and postoperative hematoma for the risk of neurologic worsening or 30-day mortality. Conclusions Early postoperative complications in meningioma surgery have a negative impact on patient survival and postoperative neurologic status, in a disease where survival is usually not limited by the meningioma itself. In this study, we identified risk factors for early postoperative complications, the identification of at-risk populations may help to prevent the occurrence of these risk factors.

• Lemée, Jean-Michel; Joswig, Holger; Broi, Michele Da; Corniola, Marco Vincenzo; Scheie, David; Schaller, Karl; Helseth, Eirik & Meling, Torstein Ragnar (2019). WHO grade I meningiomas: classification-tree for prognostic factors of survival. Neurosurgical review.  ISSN 0344-5607.  s 1- 10 . doi: 10.1007/s10143-019-01117-0 Vis sammendrag

  World Health Organization (WHO) grade I meningiomas are intracranial extracerebral tumors, in which microsurgery as a stand-alone therapy provides high rates of disease control and low recurrence rates. Our aim was to identify prognostic factors of overall survival and time-to-retreat (OS; TTR) in a cohort of patients with surgically managed WHO grade I meningioma. Patients with WHO grade I meningiomas from a retrospectively (1990 to 2002) and prospectively managed (2003 to 2010) databank of Oslo University Hospital, Norway, were included. The mean follow-up was 9.2 ± 5.7 years, with a total of 11,414 patient-years. One thousand three hundred fifty-five patients were included. The mean age was 58 ± 13.2, mean Karnofsky Performance Status (KPS) 92.6 ± 26.1 and female-to-male ratio 2.5:1. The 1-year, 5-year, 10-year, 15-year, and 20-year probabilities were 0.98, 0.91, 0.87, 0.84, and 0.8 for TTR. Patient age (OR 0.92 [0.91, 0.94]), male sex (OR 0.59 [0.45, 0.76]), preoperative KPS ≥ 70 (OR 2.22 [1.59, 3.13]), skull base location (OR 0.77 [0.60, 1]), and the occurrence of a postoperative hematoma (OR 0.44 [0.26, 0.76]) were identified as independent prognostic factors of OS. Patient age (OR 1.02 [1.01, 1.03]) and skull base location (OR 0.30 [0.21, 0.45]) were independent predictors of decreased PFS. Using a recursive partitioning analysis, we suggest a classification tree for the prediction of 5-year PFS based on patient and tumor characteristics. The findings from this cohort of meningioma WHO I patients helps to identify patients at risk of recurrence and tailor the therapeutic management. Keywords Meningioma Overall survival Prognostic factors Time-to-retreat WHO grade I

• Meling, Torstein Ragnar; Broi, Michele Da; Scheie, David; Helseth, Eirik & Smoll, Nicolas Roydon (2019). Meningioma surgery-are we making progress?. World Neurosurgery.  ISSN 1878-8750.  125(5), s e205- e213 . doi: 10.1016/j.wneu.2019.01.042 Vis sammendrag

  Background To study improvements in outcomes after surgery for intracranial meningiomas. Methods We performed a longitudinal observational study comparing 1469 patients operated on for intracranial meningioma in 4 consecutive time frames (1990–1994, 1995–1999, 2000–2004, and 2005–2010). Results Median age at surgery was 58.3 years. Median follow-up was 7 years. Patients in later periods were older than in the earlier ones (odds ratio [OR], 1.19 [1.09–1.32]; P < 0.0005), indicating a trend toward operating on more elderly patients. Before 2000, 42%, 32%, 6%, 19%, and 0.3% achieved Simpson grade (SG) I, II, III, IV, and V, respectively, whereas the SG rates were 35%, 37%, 4%, 23%, and 0.9% after 2000 (OR, 1.18 [1.06–1.30]; P < 0.005). The perioperative mortality (OR, 0.65 [0.46–0.91]; P < 0.05) and worsened neurologic outcome rate (OR, 0.70 [0.60–0.83]; P < 0.0001) were significantly lower in later decades, but the 4 surgical periods were similar regarding postoperative infections and hematomas. Retreatment-free survival (RFS) and overall survival (OS) increased significantly over the 4 time frames (P < 0.05 and P < 0.0001, respectively). Multivariate analysis confirmed the improvement of surgical radicality, neurologic outcome, perioperative mortality, OS, and RFS. Conclusions Meningioma surgery as well as patient population changed over the 2 decades considered in this study. We observed higher rates of gross total resection in the later period and the perioperative outcomes improved or were unchanged, which signifies better long-term outcomes, RFS, and OS.

• Meling, Torstein Ragnar & Patet, Gildas (2019). Clip-wrapping of ruptured blood blister-like aneurysms of the internal carotid artery. Neurosurgical review.  ISSN 0344-5607.  s 1- 7 . doi: 10.1007/s10143-019-01172-7

Se alle arbeider i Cristin

• Meling, Torstein Ragnar (2020). Cerebral bypass surgery.
• Meling, Torstein Ragnar (2020). Comprehensive Management of Vestibular Schwannoma. Acta Neurochirurgica.  ISSN 0001-6268.  10 . doi: DOI: 10.1007/s00701-017-3174-4
• Meling, Torstein Ragnar (2020). Craniopharyngiomas.
• Meling, Torstein Ragnar (2020). Cranioplasty.
• Meling, Torstein Ragnar (2020). Intra-dural tumors.
• Meling, Torstein Ragnar (2020). Microsurgical techniques: aorto-aortic termino-terminal anastomosis on rats.
• Meling, Torstein Ragnar (2020). Orbital tumors.
• Meling, Torstein Ragnar (2020). Pterional craniotomy.
• Meling, Torstein Ragnar (2020). Supratentorial decompressive craniectomy.
• Meling, Torstein Ragnar (2020). The EANS Specialist of Neurosurgery Diploma. Acta Neurochirurgica.  ISSN 0001-6268.  10 . doi: DOI: 10.1007/s00701-020-04220-0
• Meling, Torstein Ragnar (2020). The Role of Bypass Surgery in Ruptured ICA Blister-Like Aneurysms.
• Meling, Torstein Ragnar (2020). The one-layer technique for pterional craniotomy.
• Meling, Torstein Ragnar (2020). The two-layer technique for pterional craniotomy.
• Vargas, Maria Isabel; Delattre, Benedicte; Vayssiere, Pia; Corniola, Marco V. & Meling, Torstein Ragnar (2020). Intraoperative Magnetic Resonance and Synthetic Imaging. American Journal of Neuroradiology.  ISSN 0195-6108.  41(2), s E4- E6 . doi: doi:10.3174/ajnr.A6373
• Bains, Simer Jit; Niehusmann, Pitt; Meling, Torstein Ragnar; Saxhaug, Cathrine; Züchner, Mark & Brandal, Petter (2019). Disseminated central nervous system hemangioblastoma in a patient with no clinical or genetic evidence of von Hippel-Lindau disease-a case report and literature review. Acta Neurochirurgica.  ISSN 0001-6268.  161(2), s 343- 349 . doi: 10.1007/s00701-019-03800-z
• Blenkmann, Alejandro Omar; Solbakk, Anne-Kristin; Lubell, James; Leske, Sabine Liliana; Llorens, Anaïs; Funderud, Ingrid; Collavini, Santiago; Larsson, Pål Gunnar; Ivanovic, Jugoslav; Meling, Torstein Ragnar; Bekinschtein, Tristan; Kochen, Silvia; Knight, Robert T. & Endestad, Tor (2019). Human brain network involved in auditory deviance detection: Evidence from intracranial EEG recordings.
• Blenkmann, Alejandro Omar; Solbakk, Anne-Kristin; Lubell, James; Leske, Sabine Liliana; Llorens, Anaïs; Funderud, Ingrid; Collavini, Santiago; Larsson, Pål Gunnar; Ivanovic, Jugoslav; Meling, Torstein Ragnar; Bekinschtein, Tristan; Kochen, Silvia; Knight, Robert T & Endestad, Tor (2019). Human brain network involved in auditory deviance detection: Evidence from intracranial EEG recordings. Vis sammendrag

  The neural network underlying human auditory deviance detection is not fully understood. To address this, we recorded intracranial EEG from 22 adult patients with drug resistant epilepsy undergoing presurgical monitoring who had depth electrodes implanted in all brain lobes (1193 channels in total). Patients passively heard a stream of bilaterally presented tones while reading. We used the Optimum-1 paradigm, that consisted of 300 standard tones interleaved with 300 randomly presented deviant tones per block. Patients completed between 3 to 10 blocks. Deviant tones differed from standards in: 1) intensity (louder or softer), 2) frequency (higher or lower), 3) sound source location (right or left), 4) a shorter duration, or 5) a silent gap in the middle of the tone (Näätänen et al., 2004). Electrode coordinates were obtained from coregistered MRI and CT images using iElectrodes toolbox (Blenkmann et al., 2017). Channels were bipolar referenced and high frequency band activity (HFA) analytic amplitude signal was obtained using the Hilbert transform (75-145 Hz). Compared to the baseline period, significant HFA responses to tones in general were observed in 31% of the channels. We used an ANOVA to quantify the HFA response variance across trials that could be explained by the different factors of the stimuli: Intensity, Laterality, Frequency, Duration and Gap. We estimated the amount of explained variance by using ?2 (Siegel et al., 2015). Eighteen % of the channels showed a significant increase of the condition-specific explained variance. Some channels showed condition-specific activations to one particular deviant, while others showed activations to a combination of two or more deviants. The channels showing responses to tones in general and condition-specific effects were mostly observed bilaterally in temporal cortex. Frontal, anterior cingulate, and parietal cortices were also involved to a lesser extent. Our results, in line with the predictive coding framework, reveal that a distributed brain network is involved in auditory processing and deviance detection.

• Leske, Sabine Liliana; Lubell, James Isaac; Blenkmann, Alejandro Omar; Llorens, Anaïs; Funderud, Ingrid; Foldal, Maja Dyhre; Larsson, Pål Gunnar; Ivanovic, Jugoslav; Meling, Torstein Ragnar; Knight, Robert Thomas; Danielsen, Anne; Endestad, Tor & Solbakk, Anne-Kristin (2019). Auditory prediction and prediction error in self-generated tones.
• Leske, Sabine Liliana; Lubell, James; Blenkmann, Alejandro Omar; Llorens, Anaïs; Funderud, Ingrid; Foldal, Maja Dyhre; Larsson, Pål Gunnar; Ivanovic, Jugoslav; Meling, Torstein Ragnar; Knight, Robert Thomas; Danielsen, Anne; Endestad, Tor & Solbakk, Anne-Kristin (2019). Action-based auditory predictions. Vis sammendrag

  Sensory consequences of actions are predicted by the brain via an internal forward model to prepare sensory cortical areas, referred to as motor prediction. In a similar vein, the predictive coding framework suggests that perception is based on internal models making predictions about sensory events, based on statistical probabilities of the stimuli. In the current study we investigated action-based sensory predictions. We used a self-paced, two-choice random generation task, infrequently inducing deviant outcomes of voluntary action. Participants repeatedly pressed a right and a left button normatively associated with a 70 ms long 1 kHz and 2 kHz tone, respectively. Occasional deviants occurred, inverting the learned button-tone association. Participants were instructed that their button presses should be random, at a regular but self-paced tempo of one press per 1-2 s, and that they should press both buttons with equal probability. They were informed that the tones are task-irrelevant. We used intracranial EEG (iEEG) data recorded from 10 adult patients with electrodes localized in frontal and temporal lobes. The patients had drug resistant epilepsy and were undergoing presurgical monitoring via implanted stereotactic electrodes. Electrode coordinates and anatomical labels were obtained from coregistered MRI and CT images using iElectrodes toolbox. Initial results indicate that violations of action intentions modulated high frequency band activity (HFA, 75-145 Hz) in distributed brain regions including temporal and prefrontal cortices.

• Meling, Torstein Ragnar (2019). Anterior clinoidectomy - what, why & how?.
• Meling, Torstein Ragnar (2019). Anterior cranial fossa repairs.
• Meling, Torstein Ragnar (2019). Assessment of clinical outcomes of patients with multidisciplinary management of cochleo-vestibular schwannoma.
• Meling, Torstein Ragnar (2019). Brain cancer.
• Meling, Torstein Ragnar (2019). Bypass: aneurysms.
• Meling, Torstein Ragnar (2019). Bypass: aneurysms. Case presentations.
• Meling, Torstein Ragnar (2019). Craniopharyngiomas.
• Meling, Torstein Ragnar (2019). Cranioplasty.
• Meling, Torstein Ragnar (2019). Dual Pathologies: Pial Arteriovenous Fistula in Combination with an Arteiorvenous Malformation.
• Meling, Torstein Ragnar (2019). Early postoperative complications in meningioma: Predictive factors and impact on outcome.
• Meling, Torstein Ragnar (2019). Early postoperative complications in meningioma: predictive factors and impact on outcome.
• Meling, Torstein Ragnar (2019). Exploring unruptured intracranial aneurysm instability-markers in lumen morphology, dome wall aspect, and histology to improve disease-modelling.
• Meling, Torstein Ragnar (2019). Extent of resection in meningioma: predictive factors and clinical implications.
• Meling, Torstein Ragnar (2019). Frontobasal craniotomies.
• Meling, Torstein Ragnar (2019). Frontolateral Approach to the Orbit, In Andreas Raabe (ed.),  The Craniotomy Atlas.  Thieme Medical Publishers.  ISBN 9783132057913.  9.1 Frontolateral Approach to the Orbit.
• Meling, Torstein Ragnar (2019). Fronto-temporo-parietal craniotomy.
• Meling, Torstein Ragnar (2019). Giant aneurysm of the anterior circulation - How I do it.
• Meling, Torstein Ragnar (2019). Hybrid cerebrovascular surgery in the 21st century - Quo Vadis?.
• Meling, Torstein Ragnar (2019). ICA blister aneurysms.
• Meling, Torstein Ragnar (2019). ICA blister aneurysms.
• Meling, Torstein Ragnar (2019). Indications for bypass: ischemia.
• Meling, Torstein Ragnar (2019). Intracranial Aneurysms are more frequently located in the Sylvian bifurcation in Polycystic Kidney Disease patients as compared to Sporadic patients.
• Meling, Torstein Ragnar (2019). Lateral Orbitotomy, In Andreas Raabe (ed.),  The Craniotomy Atlas.  Thieme Medical Publishers.  ISBN 9783132057913.  9.2 Lateral Orbitotomy.
• Meling, Torstein Ragnar (2019). Lateral Sphenoid wing Meningiomas with bone invasion- still skull base surgery?.
• Meling, Torstein Ragnar (2019). Lumbar disc herniation - indications and surgical technique.
• Meling, Torstein Ragnar (2019). Lumbar micro-decompression.
• Meling, Torstein Ragnar (2019). Masterclass: Meningioma surgery.
• Meling, Torstein Ragnar (2019). Masterclass: Transbasal resections.
• Meling, Torstein Ragnar (2019). Meningiomas of the skull base: treatment, outcome, follow-up.
• Meling, Torstein Ragnar (2019). Microsurgical Training between Scylla and Charybdis.
• Meling, Torstein Ragnar (2019). Microsurgical techniques: aorto-aortic termino-terminal anastomosis on rats.
• Meling, Torstein Ragnar (2019). Microvascular surgery.
• Meling, Torstein Ragnar (2019). Multidisciplinary approach to patients with cervical myelopathy: Is it possible to identify the best responders to surgery?.
• Meling, Torstein Ragnar (2019). Neurosurgical Training - idir dhá thine Bhealtaine.
• Meling, Torstein Ragnar (2019). Orbital tumours.
• Meling, Torstein Ragnar (2019). Posterior fossa arteriovenous malformations - experience with 14 patients.
• Meling, Torstein Ragnar (2019). Posterior fossa lesion resection and post-operative hydrocephalus: A multicenter retrospective study for risk factor identification and state-of-art treatment methods.
• Meling, Torstein Ragnar (2019). Principles of aneurysm surgery.
• Meling, Torstein Ragnar (2019). Pterional craniotomy.
• Meling, Torstein Ragnar (2019). Pterional craniotomy - «one layer approach».
• Meling, Torstein Ragnar (2019). Rare aneurysms. What we need to know.
• Meling, Torstein Ragnar (2019). Skull base approaches in vascular neurosurgery.
• Meling, Torstein Ragnar (2019). Skull base versus skull top meningiomas.
• Meling, Torstein Ragnar (2019). Supratentorial decompressive craniectomy.
• Meling, Torstein Ragnar (2019). Surgical Simulation Training And Patient Outcomes: A Systematic Review.
• Meling, Torstein Ragnar (2019). Surgical management of CSF fistulae.
• Meling, Torstein Ragnar (2019). Surgical vs endovascular treatment for unruptured intracranial aneurysms: When to choose what?.
• Meling, Torstein Ragnar (2019). Survival and risk analysis of shunting after surgery for brain tumours in the adult population.
• Meling, Torstein Ragnar (2019). Technical and non-technical skills training by combined simulation and cadaver lab dissection: The ABC Basic Brain Course (Mi-Ge).
• Meling, Torstein Ragnar (2019). The Fronto-Temporal Orbito-Zygomatic Craniotomy.
• Meling, Torstein Ragnar (2019). The Supraorbital Craniotomy.
• Meling, Torstein Ragnar (2019). The bifrontal approach.
• Meling, Torstein Ragnar (2019). The bifrontal approach.
• Meling, Torstein Ragnar (2019). The interfacial technique for pterional craniotomy.
• Meling, Torstein Ragnar (2019). The one-layer technique for pterional craniotomy.
• Meling, Torstein Ragnar (2019). The one-layer technique for pterional craniotomy.
• Meling, Torstein Ragnar (2019). Transcavernous approach to basilar tip aneurysms.
• Meling, Torstein Ragnar (2019). Trans-sinusal / bifrontal approach and surgical anatomy of frontal area.
• Meling, Torstein Ragnar (2019). What is the best therapeutic approach to a pediatric patient with a deep-seated brain AVM?.
• Meling, Torstein Ragnar & König, Marton (2019). Bifrontal craniotomy, In Andreas Raabe (ed.),  The Craniotomy Atlas.  Thieme Medical Publishers.  ISBN 9783132057913.  5.1.1.  s 112 - 118 Vis sammendrag

  Given that the great majority of brain surgeries are preceded by a craniotomy, mastering the procedure is essential for junior residents. Choosing the appropriate craniotomy and executing it safely is the difference between a straightforward case with good access to the target and a procedure where access to the target is needlessly traumatic and may even be impossible. Professor Raabe's The Craniotomy Atlas provides precise instructions for performing all common neurosurgical cranial exposures, including: convexity approaches, midline approaches, skull base approaches, transsphenoidal approaches and more. Instructions for each craniotomy include positioning, head fixation, aesthetic considerations, and protecting the dura mater.

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