Publications 2025

Frič R, Due-Tønnessen BJ, Guzman R, Constantini S (2025)
Surgical strategies in pediatric craniopharyngioma-really a "pendulum" of surgical radicality or rather an evolution towards preserving the long-term quality of life?
Childs Nerv Syst, 41 (1), 218
DOI 10.1007/s00381-025-06877-3, PubMed 40555898

Laustsen AF, Avula S, Grønbæk J, Pizer B, Nyman P, Nilsson P, Frič R, Hjort MA, Beneš V, Hauser P, Pálmafy B, Rutkauskiene G, Wilhelmy F, Brandsma R, Sehested A, Mathiasen R, Juhler M (2025)
Tumour volume as a predictor of postoperative speech impairment in children undergoing resection of posterior fossa tumours: a prospective, multicentre study
Acta Neurochir (Wien), 167 (1), 97
DOI 10.1007/s00701-025-06459-x, PubMed 40178678

Persson K, Grønbæk J, Tiberg I, Fyrberg Å, Castor C, Andreozzi B, Frič R, Hauser P, Kiudeliene R, Mallucci C, Mathiasen R, Nyman P, Pizer B, Sehested A, Boeg Thomsen D, CMS study group (2025)
Postoperative word-finding difficulties in children with posterior fossa tumours: a crosslinguistic European cohort study
Childs Nerv Syst, 41 (1), 128
DOI 10.1007/s00381-025-06787-4, PubMed 40075014

Tuft M, Berger YØ, Marthinsen PB, Due-Tønnessen BJ, Frič R (2025)
Surgical treatment of subependymal giant cell astrocytoma in patients with tuberous sclerosis complex-an institutional experience and results
Childs Nerv Syst, 41 (1), 126
DOI 10.1007/s00381-025-06779-4, PubMed 40035895

Publications 2024

Frič R, Beyer MK, Due-Tønnessen BJ (2024)
Regression of Chiari malformation type 2 following early postnatal meningomyelocele repair-a retrospective observation from an institutional series of patients
Childs Nerv Syst, 40 (11), 3641-3646
DOI 10.1007/s00381-024-06586-3, PubMed 39207525

Frič R, Bryne E, Warsza B, Due-Tønnessen BJ, Eide PK (2024)
Preoperative estimation of intracranial compliance in symptomatic children with Chiari malformation type 1: impact on outcome and risk of complications
Acta Neurochir (Wien), 166 (1), 22
DOI 10.1007/s00701-024-05897-3, PubMed 38236374

Frič R, Bryne E, Warsza B, Eide PK (2024)
Intracranial pulse pressure amplitude as an indicator of intracranial compliance: observations in symptomatic children with Chiari malformation type I
J Neurosurg Pediatr, 34 (3), 293-300
DOI 10.3171/2024.4.PEDS24168, PubMed 38968616

Frič R, Heier I, Züchner M, Gjertsen Ø, Rezai M (2024)
Cerebrospinal fluid-lymphatic fistula in a child with generalized lymphatic anomaly treated with targeted blood patch - a rare case report and review of the literature
Childs Nerv Syst, 40 (4), 1301-1305
DOI 10.1007/s00381-024-06287-x, PubMed 38236406

Ødegaard CS, Samersaw-Lund MB, Fric R, Kirschner RS, Husebye ES, Olsson SJ, Kahn P (2024)
[Ethical backbone in the face of political conflict]
Tidsskr Nor Laegeforen, 144 (2)
DOI 10.4045/tidsskr.24.0034, PubMed 38349097

Publications 2023

Frič R, König M, Due-Tønnessen BJ, Ramm-Pettersen J, Berg-Johnsen J (2023)
Long-term outcome of patients treated for craniopharyngioma: a single center experience
Br J Neurosurg, 39 (1), 52-60
DOI 10.1080/02688697.2023.2179600, PubMed 36799140

Frič R, Ringstad G, Eide PK (2023)
Low versus High Intracranial Compliance in Adult Patients with Chiari Malformation Type 1-Comparison of Long-Term Outcome After Tailored Treatment
World Neurosurg, 173, e699-e707
DOI 10.1016/j.wneu.2023.02.134, PubMed 36889634

Publications 2022

Frič R, Sorteberg A, Wallace S, Alonso AS, Due-Tønnessen BJ, Wiedmann M (2022)
[Moyamoya disease in children]
Tidsskr Nor Laegeforen, 142 (13)
DOI 10.4045/tidsskr.21.0776, PubMed 36164799

Grønbæk JK, Laustsen AF, Toescu S, Pizer B, Mallucci C, Aquilina K, Molinari E, Hjort MA, Gumbeleviciene L, Hauser P, Pálmafy B, van Baarsen K, Hoving E, Zipfel J, Ehrstedt C, Grillner P, Callesen MT, Frič R, Wibroe M, Nysom K, Schmiegelow K, Sehested A, Mathiasen R, Juhler M, CMS study group (2022)
Left-handedness should not be overrated as a risk factor for postoperative speech impairment in children after posterior fossa tumour surgery: a prospective European multicentre study
Childs Nerv Syst, 38 (8), 1479-1485
DOI 10.1007/s00381-022-05567-8, PubMed 35759029

Grønbæk JK, Toescu S, Frič R, Nilsson P, Castor C, Mallucci C, Pizer B, Aquilina K, Molinari E, Hjort MA, Karppinen A, Rutkauskiene G, Mudra K, Markia B, van Baarsen K, Hoving E, Zipfel J, Wibroe M, Nysom K, Schmiegelow K, Sehested A, Mathiasen R, Juhler M, CMS study group (2022)
Postoperative speech impairment and cranial nerve deficits after secondary surgery of posterior fossa tumours in childhood: a prospective European multicentre study
Childs Nerv Syst, 38 (4), 747-758
DOI 10.1007/s00381-022-05464-0, PubMed 35157109

Niehusmann P, Stensvold E, Leske H, Pietsch T, Goschzik T, Gielen GH, Due-Tønnessen B, Frič R, Nilssen Y, Brandal P (2022)
Molecular pathological insights reveal a high number of unfavorable risk patients among children treated for medulloblastoma and CNS-PNET in Oslo 2005-2017
Pediatr Blood Cancer, 69 (9), e29736
DOI 10.1002/pbc.29736, PubMed 35570402

Publications 2021

Fric R (2021)
Should the Journal really publish political articles?
Tidsskr. Nor. Laegeforen., 141 (11), 1032

Frič R, Langvatn EA, Due-Tønnessen BJ, Eide PK (2021)
The role of pulsatile and static intracranial pressure measurements in the management of children with craniosynostosis-an institutional experience from 49 patients
Acta Neurochir (Wien), 163 (7), 2015-2023
DOI 10.1007/s00701-020-04680-4, PubMed 33389123

Frič R, Nedregaard B, Heimdal KR, Weber C, Due-Tønnessen BJ (2021)
Ruptured Aneurysm of the Anterior Communicating Artery in a Newborn: A Case Report and Review of the Literature
J Neurol Surg A Cent Eur Neurosurg, 84 (4), 399-403
DOI 10.1055/s-0041-1739209, PubMed 34897611

Grønbæk JK, Wibroe M, Toescu S, Frič R, Thomsen BL, Møller LN, Grillner P, Gustavsson B, Mallucci C, Aquilina K, Fellows GA, Molinari E, Hjort MA, Westerholm-Ormio M, Kiudeliene R, Mudra K, Hauser P, van Baarsen K, Hoving E, Zipfel J, Nysom K, Schmiegelow K, Sehested A, Juhler M, Mathiasen R et al. (2021)
Postoperative speech impairment and surgical approach to posterior fossa tumours in children: a prospective European multicentre cohort study
Lancet Child Adolesc Health, 5 (11), 814-824
DOI 10.1016/S2352-4642(21)00274-1, PubMed 34624241

Lundar T, Due-Tønnessen BJ, Frič R, Brandal P, Due-Tønnessen P (2021)
Choroid Plexus Tumors in Children: Long-Term Follow-Up of Consecutive Single-Institutional Series of 59 Patients Treated over a Period of 8 Decades (1939-2020)
World Neurosurg, 158, e810-e819
DOI 10.1016/j.wneu.2021.11.070, PubMed 34823041

Lundar T, Due-Tønnessen BJ, Frič R, Sundseth J, Brandal P, Due-Tønnessen P (2021)
Outcome After Treatment of Spinal Ependymoma in Children and Adolescents: Long-Term Follow-up of a Single Consecutive Institutional Series of 33 Patients Treated Over Eight Decades
World Neurosurg, 150, e228-e235
DOI 10.1016/j.wneu.2021.02.131, PubMed 33684583

Lundar T, Due-Tønnessen BJ, Frič R, Sundseth J, Brandal P, Due-Tønnessen P (2021)
Outcome after treatment of pediatric supratentorial ependymoma: long-term follow-up of a single consecutive institutional series of 26 patients
Br J Neurosurg, 38 (2), 514-522
DOI 10.1080/02688697.2021.1914821, PubMed 34096810

Weber C, Myrseth E, Kurz KD, Fric R, Ingebrigtsen T, Helseth E, Nygaard OP, Kvistad KA (2021)
MRI of neck in weight-bearing position?
Tidsskr. Nor. Laegeforen., 141 (11), 1063-1064

Weber C, Myrseth E, Kurz KD, Fric R, Ingebrigtsen T, Helseth E, Nygaard ØP, Kvistad KA (2021)
[Weight-bearing magnetic resonance imaging of the neck?]
Tidsskr Nor Laegeforen, 141 (11)
DOI 10.4045/tidsskr.21.0284, PubMed 34423961

Publications 2020

Frič R (2020)
Upright magnetic resonance imaging in diagnostics of Chiari malformation type 1 - cui bono?
Acta Neurochir (Wien), 162 (7), 1549-1550
DOI 10.1007/s00701-020-04297-7, PubMed 32215741

Frič R, Due-Tønnessen BJ, Lundar T, Egge A, Kronen Krossnes B, Due-Tønnessen P, Stensvold E, Brandal P (2020)
Long-term outcome of posterior fossa medulloblastoma in patients surviving more than 20 years following primary treatment in childhood
Sci Rep, 10 (1), 9371
DOI 10.1038/s41598-020-66328-8, PubMed 32523021

Lundar T, Due-Tønnessen BJ, Frič R, Brandal P, Due-Tønnessen P (2020)
Adult outcome after treatment of pediatric posterior fossa ependymoma: long-term follow-up of a single consecutive institutional series of 22 patients with more than 5 years of survival
J Neurosurg Pediatr, 26 (1), 22-26
DOI 10.3171/2020.1.PEDS19700, PubMed 32217795

Lundar T, Due-Tønnessen BJ, Frič R, Brandal P, Stensvold E, Due-Tønnessen P (2020)
Outcomes in adulthood after neurosurgical treatment of brain tumors in the first 3 years of life: long-term follow-up of a single consecutive institutional series of 97 patients
Childs Nerv Syst, 37 (2), 427-433
DOI 10.1007/s00381-020-04859-1, PubMed 32814984

Publications 2019

Frič R, Eide PK (2019)
Chiari type 1-a malformation or a syndrome? A critical review
Acta Neurochir (Wien), 162 (7), 1513-1525
DOI 10.1007/s00701-019-04100-2, PubMed 31656982

Fric R, Ringstad G, Eide PK (2019)
[Chiari malformation type 1 – diagnosis and treatment]
Tidsskr Nor Laegeforen, 139 (10)
DOI 10.4045/tidsskr.18.0455, PubMed 31238671

Fric R, Ringstad G, Eide PK (2019)
Chiari malformation type 1- diagnostics and treatment
Tidsskr. Nor. Laegeforen., 139 (10), 931-935

Langvatn EA, Frič R, Due-Tønnessen BJ, Eide PK (2019)
Intracranial volume versus static and pulsatile intracranial pressure values in children with craniosynostosis
J Neurosurg Pediatr, 24 (1), 66-74
DOI 10.3171/2019.2.PEDS18767, PubMed 31003225

Lundar T, Due-Tønnessen BJ, Frič R, Brandal P, Stensvold E, Due-Tønnessen P (2019)
Adult outcome after neurosurgical treatment of brain tumours in the first year of life: long-term follow-up of a single consecutive institutional series of 34 patients
Acta Neurochir (Wien), 161 (9), 1793-1798
DOI 10.1007/s00701-019-04014-z, PubMed 31309304

Lundar T, Due-Tønnessen BJ, Frič R, Krossnes B, Brandal P, Stensvold E, Due-Tønnessen P (2019)
Neurosurgical treatment of pediatric pleomorphic xanthoastrocytomas: long-term follow-up of a single-institution, consecutive series of 12 patients
J Neurosurg Pediatr, 23 (4), 512-516
DOI 10.3171/2018.11.PEDS18449, PubMed 30738389

Publications 2018

Diets IJ, Prescott T, Champaigne NL, Mancini GMS, Krossnes B, Frič R, Kocsis K, Jongmans MCJ, Kleefstra T (2018)
A recurrent de novo missense pathogenic variant in SMARCB1 causes severe intellectual disability and choroid plexus hyperplasia with resultant hydrocephalus
Genet Med, 21 (3), 572-579
DOI 10.1038/s41436-018-0079-4, PubMed 29907796

Fric R (2018)
[Not Available]
Tidsskr Nor Laegeforen, 138 (8)
DOI 10.4045/tidsskr.18.0135, PubMed 29737780

Lundar T, Due-Tønnessen BJ, Fric R, Due-Tønnessen P (2018)
Postoperative radiotherapy for pediatric brain tumor: a lesson learned from treatment of a 5-year-old girl for posterior fossa astrocytoma (WHO1) in 1967
Acta Neurochir (Wien), 160 (10), 2065-2066
DOI 10.1007/s00701-018-3636-3, PubMed 30046877

Lundar T, Due-Tønnessen BJ, Fric R, Egge A, Krossnes B, Due-Tønnessen P, Stensvold E, Brandal P (2018)
Neurosurgical treatment of gangliogliomas in children and adolescents: long-term follow-up of a single-institution series of 32 patients
Acta Neurochir (Wien), 160 (6), 1207-1214
DOI 10.1007/s00701-018-3550-8, PubMed 29680921

Publications 2017

Frič R, Pripp AH, Eide PK (2017)
Cardiovascular risk factors in Chiari malformation and idiopathic intracranial hypertension
Brain Behav, 7 (5), e00677
DOI 10.1002/brb3.677, PubMed 28523220

Gadde JA, Shah V, Liebo GB, Ringstad GA, Pomeraniec IJ, Bakke SJ, Fric R, Ksendzovsky A, Jane JA, Schwartz ES, Haughton V (2017)
Anatomical features of the cervical spinal canal in Chiari I deformity with presyrinx: A case-control study
Neuroradiol J, 30 (5), 405-409
DOI 10.1177/1971400917718842, PubMed 28691569

Ramm-Pettersen J, Frič R, Berg-Johnsen J (2017)
Long-term follow-up after endoscopic trans-sphenoidal surgery or initial observation in clivus chordomas
Acta Neurochir (Wien), 159 (10), 1849-1855
DOI 10.1007/s00701-017-3236-7, PubMed 28623412

Stensvold E, Krossnes BK, Lundar T, Due-Tønnessen BJ, Frič R, Due-Tønnessen P, Bechensteen AG, Myklebust TÅ, Johannesen TB, Brandal P (2017)
Outcome for children treated for medulloblastoma and supratentorial primitive neuroectodermal tumor (CNS-PNET) - a retrospective analysis spanning 40 years of treatment
Acta Oncol, 56 (5), 698-705
DOI 10.1080/0284186X.2017.1301679, PubMed 28325133

Publications 2016

Frič R, Eide PK (2016)
Comparative observational study on the clinical presentation, intracranial volume measurements, and intracranial pressure scores in patients with either Chiari malformation Type I or idiopathic intracranial hypertension
J Neurosurg, 126 (4), 1312-1322
DOI 10.3171/2016.4.JNS152862, PubMed 27341045

Frič R, Hald JK, Antal EA (2016)
Benign Sphenoid Wing Meningioma Presenting with an Acute Intracerebral Hemorrhage - A Case Report
J Cent Nerv Syst Dis, 8, 1-4
DOI 10.4137/JCNSD.S33653, PubMed 27127413

Frič R, Lindstrøm EK, Ringstad GA, Mardal KA, Eide PK (2016)
The association between the pulse pressure gradient at the cranio-cervical junction derived from phase-contrast magnetic resonance imaging and invasively measured pulsatile intracranial pressure in symptomatic patients with Chiari malformation type 1
Acta Neurochir (Wien), 158 (12), 2295-2304
DOI 10.1007/s00701-016-2979-x, PubMed 27743249

Publications 2015

Frič R, Eide PK (2015)
Comparison of pulsatile and static pressures within the intracranial and lumbar compartments in patients with Chiari malformation type 1: a prospective observational study
Acta Neurochir (Wien), 157 (8), 1411-23; discussion 1423
DOI 10.1007/s00701-015-2465-x, PubMed 26105759

Frič R, Eide PK (2015)
Perioperative monitoring of pulsatile and static intracranial pressure in patients with Chiari malformation type 1 undergoing foramen magnum decompression
Acta Neurochir (Wien), 158 (2), 341-7; discussion 346-7
DOI 10.1007/s00701-015-2669-0, PubMed 26711284

Publications 2013

Jusufovic M, Due-Tønnessen P, Fric R, Stenset V (2013)
Subdural empyema
Tidsskr Nor Laegeforen, 133 (15), 1601
DOI 10.4045/tidsskr.13.0164, PubMed 23970275

Publications 2011

Dahlback HS, Brandal P, Krossnes BK, Fric R, Meling TR, Meza-Zepeda LA, Danielsen HE, Heim S (2011)
Multiple chromosomal monosomies are characteristic of giant cell ependymoma
Hum Pathol, 42 (12), 2042-6
DOI 10.1016/j.humpath.2011.02.012, PubMed 21683982

Publications 2010

Frič R, Eide PK (2010)
The presigmoid approach for removal of tumours causing ventral compression of the brainstem. Surgical results and postoperative quality of life
Br J Neurosurg, 25 (1), 86-93
DOI 10.3109/02688697.2010.525266, PubMed 20979440