Role of magnetic resonance imaging in differentiating intrasellar cavernous hemangioma and pituitary adenoma: A case report-Decipit frons prima multos.

BACKGROUND: Cavernous hemangioma represents a rare vascular malformation usually located in the cavernous sinus that could be exceptionally found purely in the intrasellar region. The clinical presentation of intrasellar cavernous hemangioma (ICH), frequently variable and unspecific, poses the patient at risk for misdiagnosis and the clinical consequences of suboptimal treatment. We present a case of ICH and describe the advanced magnetic resonance imaging (MRI) features that should direct toward the clinical suspicion of ICH. CASE PRESENTATION: An illustrative case of a 61-year-old man complaining of recurrent headaches and diagnosed with a sellar and parasellar lesion was reported and used as a cue to discuss MRI imaging sequences that may aid in the distinction of ICH from pituitary adenoma and other skull base lesions. Heterogeneous enhancement followed by intense homogeneous enhancement at the dynamic contrast-enhanced sequences ("fill-in" phenomenon), absence of blooming signs at the gradient recalled echo (GRE) T2*-weighted and/or susceptibility-weighted imaging (SWI) MRI sequences, and elevated apparent diffusion coefficient (ADC) values usually characterize ICH instead of pituitary adenoma. CONCLUSION: Advanced MRI imaging plays an invaluable role in the pre-operative characterization of skull base lesions. Although rare, skull base surgeons should be aware of the ICH in the differential diagnosis process in case of the intrasellar lesion, and a tailored MRI examination should be performed to direct the patient toward the safest and optimal treatment.

Bow hunter's syndrome successfully treated with a posterior surgical decompression approach: A case report and review of literature.

BACKGROUND: Bow hunter's syndrome (BHS) is a rare but surgically treatable cause of vertebrobasilar insufficiency due to dynamic rotational occlusion of the vertebral artery. Typically, patients present with posterior circulation transient ischaemic symptoms such as presyncope, syncope, vertigo, diplopia, and horizontal nystagmus, but irreversible deficits, including medullary and cerebellar infarctions, have also been described. CASE SUMMARY: A 70-year-old patient presented an acute onset of vertigo and gait instability triggered by right head rotation. His medical history included previous episodes of unilateral left neck and occipital pain followed by light-headedness, sweating, and blurred vision when turning his head, and these episodes were associated with severe degenerative changes in the atlanto-dens and left atlanto-axial facet joints and right rotation of the C2 cervical vertebrae. Brain magnetic resonance imaging revealed the presence of acute bilateral cerebellar ischaemic lesions, while static vascular imaging did not reveal any vertebral artery abnormalities. Dynamic ultrasonography and angiography were performed and confirmed the presence of a dynamic occlusion of the vertebral artery V3-V4 segment when the head was rotated to the right secondary to left C1-C2 bone spur compression. Surgical decompression led to complete resolution of paroxysmal symptoms without neurological sequelae. CONCLUSION: BHS should be considered in cases of repeated posterior circulation transient ischaemic attack or ischaemic stroke, particularly when associated with high cervical spine abnormalities.

Intramedullary spinal cord tumors: the value of intraoperative neurophysiological monitoring in a series of 57 cases from two Italian centers.

BACKGROUND: Intramedullary spinal cord tumors are rare lesions of the central nervous system. Anatomical, molecular and radiological features are well defined, but correct management is still matter of debate. Pertinent literature has reported conflicting opinions regarding the use of intraoperative electrophysiological monitoring (IONM) in the surgical treatment of this kind of lesions, recently. We report a retrospective study from two Italian centers, in order to highlight the usefulness of IONM in the management of intramedullary lesions. METHODS: We performed a retrospective review of patients with intramedullary spinal tumor who underwent surgical resection from February 2011 to February 2018 in two different institutions. Clinical and radiological data, lesion features, timing of symptom onset and IONM findings were recorded. The IONM included somatosensory-evoked potentials (SSEP), motor-evoked potentials (MEP) and D-Wave whenever possible. We evaluated the outcome according to the Modified McCormick scale. We also evaluated the accuracy and relevance of surgical outcomes for each evoked potential (SSEP, MEP, D-Wave). RESULTS: A total of 57 patients were included. A gross total removal was achieved in 46 cases. Neurological follow-up was assessment at 3 days, and 3 and 6 months after surgery. Comparing the preoperative status and 6 months follow-up: the modified McCormick scale showed a neurological stability for 30 patients (52.63%), a worsening of neurological status for 7 patients (12.28%) and an improvement for 20 patients (35.08%). IONM presented high accuracy (sensibility of 100% and specificity of 95.65%) and significantly predicted postoperative permanent motor deficits (P<0.0001; AUC=0.978). D-Wave appeared to have significant greater predictive value than MEP and especially SSEP alone (0.967 vs 0.722 vs 0.542; P=0.044 and P<0.001 respectively). CONCLUSIONS: The gold standard in the intramedullary lesion treatment is maximal safe resection with good neurological outcome, as shown in our patients. The use of IONM is helpful in intramedullary tumors resection in order to minimize postoperative neurological deficits and our analysis suggests that the use of D-Wave presents a statistically significant higher accuracy for predicting postoperative deficits than SSEP and MEP alone.

Extracranial metastases in secondary glioblastoma multiforme: a case report.

BACKGROUND: Glioblastoma (GBM) is known for its devastating intracranial infiltration and its unfavorable prognosis, while extracranial involvement is a very rare event, more commonly attributed to IDH wild-type (primary) GBM evolution. CASE PRESENTATION: We present a case of a young woman with a World Health Organization (WHO) grade II Astrocytoma evolved to WHO grade IV IDH mutant glioblastoma, with subsequent development of lymphatic and bone metastases, despite the favorable biomolecular pattern and the stability of the primary brain lesion. CONCLUSIONS: Our case highlights that grade II Astrocytoma may evolve to a GBM and rarely lead to a secondary metastatic diffusion, which can progress quite rapidly; any symptoms referable to a possible systemic involvement should be carefully investigated.

Frequency and outcome of olfactory impairment and sinonasal involvement in hospitalized patients with COVID-19.

BACKGROUND: Olfactory dysfunction has shown to accompany COVID-19. There are varying data regarding the exact frequency in the various study population. The outcome of the olfactory impairment is also not clearly defined. OBJECTIVE: To find the frequency of olfactory impairment and its outcome in hospitalized patients with positive swab test for COVID-19. METHODS: This is a prospective descriptive study of 100 hospitalized COVID-19 patients, randomly sampled, from February to March 2020. Demographics, comorbidities, and laboratory findings were analyzed according to the olfactory loss or sinonasal symptoms. The olfactory impairment and sinonasal symptoms were evaluated by 9 Likert scale questions asked from the patients. RESULTS: Ninety-two patients completed the follow-up (means 20.1 (± 7.42) days). Twenty-two (23.91%) patients complained of olfactory loss and in 6 (6.52%) patients olfactory loss was the first symptom of the disease. The olfactory loss was reported to be completely resolved in all but one patient. Thirty-nine (42.39%) patients had notable sinonasal symptoms while rhinorrhea was the first symptom in 3 (3.26%). Fifteen patients (16.3%) had a taste impairment. Patients with sinonasal symptoms had a lower age (p = 0.01). There was no significant relation between olfactory loss and sinonasal symptoms (p = 0.07). CONCLUSIONS: Sudden olfactory dysfunction and sinonasal symptoms have a considerable prevalence in patients with COVID-19. No significant association was noted between the sinonasal symptoms and the olfactory loss, which may suggest that other mechanisms beyond upper respiratory tract involvement are responsible for the olfactory loss.

Prothrombotic state induced by COVID-19 infection as trigger for stroke in young patients: A dangerous association.

•COVID-19 infection could led to a pro-inflammatory and pro-thrombotic state.•Cerebrovascular involvement may occur in COVID-19 infection even in young patients.•Physicians should be aware that stroke may be the first COVID-19 manifestation.

Minicraniotomy Under Local Anesthesia and Monitored Sedation for the Operative Treatment of Uncomplicated Traumatic Acute Extradural Hematoma.

BACKGROUND: Major craniotomy is currently the de facto operative treatment for traumatic acute extradural hematoma (AEDH). This craniotomy, involving extensive scalp dissection (the trauma flap) and major cranial bone opening, can be impracticable in the remote regions of some Western countries, and even more so in the low-resource health systems of most developing countries. METHODS: We describe the surgical technique of minicraniotomy under local anesthesia plus monitored sedation as a much less invasive operative treatment for AEDH. The results of its use in a preliminary patient group are also presented. RESULTS: The procedure has been carried out in 10 consecutive patients (7 men), including an infant 4 months of age. The age range was 4 months to 56 years. The patients suffered varying severity of head injury, with a median Glasgow Coma Scale (GCS) score of 11 out of 15 (range, 4-15). The median trauma to surgery time was 25 hours (range, 13-192 hours). The surgery was successfully completed, with hematoma evacuated and hemostasis achieved. The median duration of surgery was 90 minutes. The in-hospital outcome was Glasgow Outcome Scale score of normal status in 6 patients, moderate deficit in 2 patients, and vegetative state in the patient whose preoperative GCS score was 4. One other patient, admitted with a GCS score of 11, died 5 days postoperatively from extracranial causes. The surviving patients have been followed-up for a median time of 15 months with no new deficits. CONCLUSIONS: Compared with full craniotomy under general anesthesia, minicraniotomy under local anesthesia plus sedation may be a more pragmatic, less invasive, and low-cost surgical treatment option for uncomplicated traumatic acute extradural hematoma.

Surgical management of traumatic supra and infratentorial extradural hematomas: our experience and systematic literature review.

Post-traumatic supra and infratentorial acute extradural hematomas (SIEDHs) are an uncommon type of extradural hematoma with only few small series published. In this scenario, the purposes of the present study are to present our experience in the management of 8 patients with acute SIEDH and to perform a systematic literature review. The clinical and radiological data of 8 patients operated for SIEDH at our department were analyzed retrospectively. Using the PRISMA guidelines, we reviewed the articles published from January 1990 to January 2018 reporting data about SIEDH. A total of 3 articles fulfilled the inclusion criteria and were analyzed. The incidence of SIEDHs is very rare constituting < 2% of all traumatic extradural hematomas (EDH). SIEDHs are associated with non-specific symptoms. Only 20% of patients were in coma (GCS < 8) at admission. A "lucid interval" was not reported. The source of bleeding of SIEDH was venous in all cases due to the following: bone fracture with diploe bleeding (50%), transverse/sigmoid sinus injury (22%), oozing meningeal venous vessel (8%), detachment of transverse sinus without wall injury (6%), and unknown in the other cases. Due to the venous nature of the source of hemorrhage, the clinical manifestation of a SIEDH may develop in a slow way, but once a critical volume of hematoma is reached, the deterioration can become rapid and fatal for acute brain stem compression. Surgery is the mainstay of SIEDHs treatment: among 42 cases with SIEDH included in this review, 40 (95.23%) patients were treated with surgery while only two were managed conservatively. Also in our series, all patients underwent surgery. A combined supratentorial craniotomy and suboccipital craniotomy leaving in a bone bridge over the transverse sinus for dural tenting sutures resulted the most used and safe surgical approach. SIEDH is a rare type of EDH. Early diagnosis of SIEDH and prompt surgical evacuation with a combined supratentorial and suboccipital approach provide excellent recovery.

Functional Outcome of Elderly Patients Treated for Odontoid Fracture: A Multicenter Study.

STUDY DESIGN: Retrospective multicenter study. OBJECTIVE: Analysis of impact of conservative and surgical treatments on functional outcome of geriatric odontoid fractures. SUMMARY OF BACKGROUND DATA: Treatment of odontoid fractures in aged population is still debatable. METHODS: One hundred fourty-seven consecutive odontoid fractures in elderly patients were classified according to Anderson-D'Alonzo and Roy-Camille classifications. Philadelphia type collar was always positioned and kept as a treatment whenever acceptable. Halo-vest, anterior screw fixation, C1-C2 posterior arthrodesis, and occipito-cervical fixation were the other treatments adopted. Conservative or surgical treatment strategy was more significantly influenced by antero-posterior displacement (< or >5 mm) and by surgeon decision. On admission ASA, modified Rankin scale (mRS-pre) and Charlson Comorbidity Index (CCI) were assessed. Modified Rankin scale (mRS-post), Neck Disability Index (NDI), and Smiley Webster Pain Scale (SWPS) were administered 12 to 15 months after treatment to estimate functional outcome in terms of general disability, neck-related disability, and ability to return to work/former activity. Risk of treatment crossover was calculated considering factors affecting outcome. Fracture healing process in terms of fusion-stability, no fusion-stability, no fusion-no stability was evaluated at 12 months through a cervical computed tomography (CT) scan. Dynamic cervical spine x-rays were obtained whether necessary. No fusion-stability was considered an adequate treatment goal in our geriatric population. Chi square/Fisher exact test and logistic regression were performed for statistical anal. RESULTS: Overall 67 patients were treated conservatively whereas 80 underwent surgery. Collar was adopted in 45 patients, while anterior odontoid fixation and C1-C2 posterior arthrodesis were preferred for 30 patients each. 79.8% of patients showed good outcomes according to NDI. No significant differences were observed between patients of 65 to 79 years and more than or equal to 80 years (P = 0.81). CCI greatly correlated with mRS-post, with higher indexes in 68.8% of cases characterized by good outcomes (P = 0.05). mRS-pre correlated with NDI (P < 0.000001) and mRS-post (P = 0.04). CCI, mRS-pre, and surgery were associated with worse NDI, while both C1-C2 posterior arthrodesis and occipito-cervical stabilization were associated with worse mRS-post, respectively in 40% and 30% of cases. Younger patients had a higher risk of treatment crossover. CONCLUSION: mRS-pre and CCI provided two independent predictive values respectively for functional outcome and post-treatment disability. Compared with conservative immobilizations, surgery revealed no advantages in the elderly in terms of functional outcome. LEVEL OF EVIDENCE: 3.

Functional Outcome After Odontoid Fractures in the Elderly.

While several papers on mortality and the fusion rate in elderly patients treated surgically or non-surgically for odontoid fractures exist, little information is available on quality of life after treatment. The aim of treatment in these patients should not be fracture healing alone but also quality of life improvement.A literature search using PubMed identified seven papers including information on functional evaluation of 402 patients.Patients treated with anterior screw fixation had a good functional outcome in 92.6% of cases. This percentage seemed to decrease in octogenarians. Less information was available for patients treated with posterior approaches; it would seem that up to a half of such patients experienced pain and limitations in activities of daily living after surgery. Patients treated with a halo device had a functional outcome that was worse (or at least no better) than that of patients treated with surgery, with absence of limitations in activities of daily living in 77.3% of patients. Patients treated with a collar had a good functional outcome in the majority of cases, with absence of limitations in activities of daily living in 89% of patients.More studies are needed for evaluation of functional outcome, especially in patients treated with a collar, a halo device or a posterior approach.

Type II odontoid fracture in elderly patients treated conservatively: is fracture healing the goal?

PURPOSE: Analysis of functional outcome of elderly patients with type II odontoid fractures treated conservatively in relation to their radiological outcome. METHODS: A total of 50 geriatric patients with type II odontoid fractures were treated with Aspen/Vista collars. On admission, each patient was assessed assigning ASA score, modified Rankin Scale (mRS-pre) and Charlson Comorbidity Index (CCI). From 12-15 months after treatment, functional evaluations were performed employing a second modified Rankin Scale (mRS-post) together with Neck Disability Index (NDI) and Smiley-Webster pain scale (SWPS). Radiological outcome was evaluated through dynamic cervical spine X-rays at 3 months and cervical spine CT scans 6 months after treatment. Three different conditions were identified: stable union, stable non-union and unstable non-union. Surgery was preferred whenever a fracture gap > 2 mm, an antero-posterior displacement > 5 mm, an odontoid angulation > 11° or neurological deficits occurred. RESULTS: Among the 50 patients, 24 reached a stable union, while 26 a stable non-union. Comparing the two groups, no differences in ASA (p = 0.60), CCI (p = 0.85) and mRS-pre (p = 0.14) were noted. Similarly, no differences in mRS-post (p = 0.96), SWPS (p = 0.85) and NDI (p = 0.51) were observed between patients who reached an osseous fusion and those with a stable fibrous non-union. No effects of age, sex, ASA, mRS-pre, fracture dislocation and radiological outcome were discovered on functional outcome. At logistic regression analysis, female sex and high values of CCI emerged associated with worse NDI. CONCLUSIONS: In geriatric type II odontoid fractures, pre-injury clinical status and comorbidities overcome imaging in determining post-treatment level of function. Hard collar immobilization led to a favourable functional outcome with mRS-post, NDI and SWPS values diffusely encouraging whatever a bony union or a fibrous non-union was obtained. These slides can be retrieved under Electronic Supplementary Material.

Intraoperative neurophysiological monitoring for intradural extramedullary spinal tumors: predictive value and relevance of D-wave amplitude on surgical outcome during a 10-year experience.

OBJECTIVEThe purpose of this study was to evaluate the technical feasibility, accuracy, and relevance on surgical outcome of D-wave monitoring combined with somatosensory evoked potentials (SSEPs) and motor evoked potentials (MEPs) during resection of intradural extramedullary (IDEM) spinal tumors.METHODSClinical and intraoperative neurophysiological monitoring (IONM) data obtained in 108 consecutive patients who underwent surgery for IDEM tumors at the Institute for Scientific and Care Research "ASMN" of Reggio Emilia, Italy, were prospectively entered into a database and retrospectively analyzed. The IONM included SSEPs, MEPs, and-whenever possible-D-waves. All patients were evaluated using the modified McCormick Scale at admission and at 3, 6, and 12 months of follow-up .RESULTSA total of 108 patients were included in this study. A monitorable D-wave was achieved in 71 of the 77 patients harboring cervical and thoracic IDEM tumors (92.2%). Recording of D-waves in IDEM tumors was significantly associated only with a preoperative deeply compromised neurological status evaluated using the modified McCormick Scale (p = 0.04). Overall, significant IONM changes were registered in 14 (12.96%) of 108 patients and 9 of these patients (8.33%) had permanent loss of at least one of the 3 evoked potentials. In 7 patients (6.48%), the presence of an s18278 caudal D-wave was predictive of a favorable long-term motor outcome even when the MEPs and/or SSEPs were lost during IDEM tumor resection. However, in 2 cases (1.85%) the D-wave permanently decreased by approximately 50%, and surgery was definitively abandoned to prevent permanent paraplegia. Cumulatively, SSEP, MEP, and D-wave monitoring significantly predicted postoperative deficits (p = 0.0001; AUC = 0.905), with a sensitivity of 85.7% and a specificity of 97%. Comparing the area under the receiver operating characteristic curves of these tests, D-waves appeared to have a significantly greater predictive value than MEPs and especially SSEPs alone (0.992 vs 0.798 vs 0.653; p = 0.023 and p < 0.001, respectively). On multiple logistic regression, the independent risk factors associated with significant IONM changes in the entire population were age older than 65 years and an anterolateral location of the tumor (p < 0.0001).CONCLUSIONSD-wave monitoring was feasible in all patients without severe preoperative motor deficits. D-waves demonstrated a statistically significant higher ability to predict postoperative deficits compared with SSEPs and MEPs alone and allowed us to proceed with IDEM tumor resection, even in cases of SSEP and/or MEP loss. Patients older than 65 years and with anterolateral IDEM tumors can benefit most from the use of IONM.

Intraoperative Neurophysiological Monitoring in Surgical Treatment of Spinal Dural Arteriovenous Fistulas: Technique and Results.

OBJECTIVE AND BACKGROUND: Data on intraoperative neurophysiological monitoring (IOM) during surgery of spinal dural arteriovenous fistulas (SDAVFs) are lacking. The purpose of this study was to evaluate the role of IOM during microsurgery for SDAVFs. MATERIALS AND METHODS: From March 2007 to March 2013, 12 patients had microsurgery with IOM for SDAVFs. The IOM included somatosensory-evoked potentials, motor-evoked potentials (MEPs), and - in selected cases - D-Waves. All patients were evaluated at admission and at follow-up (6, 12, and 24 months) with Aminoff-Logue Disability Scale for Gait-Aminoff-Logue Disability Scale (G-ALS) and Micturition-Aminoff-Logue Disability Scale (M-ALS). STATISTICAL ANALYSIS USED: Logistic regression was used for detecting the clinical risk factors influencing neurological functions after the treatment. RESULTS: During surgery, we registered the absence of significant modifications of evoked potentials in nine cases (75%), while improvement of MEPs occurred in three cases (25%). No false-negative case was registered, and IOM predicted the absence of new postoperative neurological deficit in all patients. At 24-month follow-up, nine patients improved their overall neurological status, while three patients remained stable. At univariate analysis, Aminoff-Logue Disability Scales for Gait and Micturition (G + M-ALS) score at 24-month follow-up was directly associated with the duration of symptom before the surgery (P = 0.024), preoperative G-ALS (P = 0.02), M-ALS (P = 0.022), and G + M-ALS scores (P = 0.045), and improvement of IOM after occlusion of the fistula (P = 0.025). CONCLUSIONS: In our series, no significant worsening of evoked potentials occurred and subsequently the surgical strategy was not changed by IOM. However, no false-negative case was registered, and IOM predicted the absence of new postoperative neurological deficit in all patients. Patients with improvement of IOM parameters after occlusion of the fistula had greater chances of postsurgical improvement at the univariate analysis.

Septic complication following porous hydroxyapatite cranioplasty: prosthesis retention management.

After failing of autologous cranioplasty or when the bone flap is unavailable, the alloplastic (heterologous) materials are the choice for cranial reconstruction. No agreement has been reported about the material with a significant lower risk of septic complications. This is due to extremely heterogeneous prognostic factors related not only to the material used but also to the surgical procedures and/or to the timing of the procedure. More attention should be focused on the material whose characteristic could enable a delay in bacterial colonization, where an antibiotic therapy could be effective, without need of prosthesis removal. Four cases of severe septic complication following cranioplasty with porous hydroxyapatite (HA) prosthesis are presented. Patients were conservatively treated, without heterologous bone flap removal. All of our patients presented reasons for delaying HA cranioplasty removal: patients #1, 3, and 4 had an associated shunted hydrocephalus and the need for not removing the prosthesis was related to the predictable recurrence of overshunting and/or sinking skin flap syndrome. In patient #4, the revision surgery would have also damaged the microvascular flap with latissimus dorsi muscle used by plastic surgeon for skin reconstruction. In patient #2, the patient refused revision surgery. In all cases, systemic and/or radiological signs of infection were observed. In patient #2 the infective process surrounded completely the HA prosthesis, while it was located in the epidural region in patients #1 and 4. In patient #3, a surgical curettage of the infected wound was performed over the HA prosthesis. Following prosthesis retention management with antibiotic therapy, all patients revealed systemic and/or radiological signs of sepsis resolution at follow-up. The possibility to avoid a prosthesis removal with effective antibiotic treatment is mainly due to the combination of three factors: targeted antibiotic therapy, good anatomical area revascularization (resulting of an "in situ" intake of antibiotics), and the biomimetism of HA prosthesis. Further investigations in a larger number of cases need to confirm these observations.

Prognostic value of MGMT promoter status in non-resectable glioblastoma after adjuvant therapy.

BACKGROUND: Methylation of MGMT promoter has been identified as a favourable predictive factor of benefit from XRT/TMZ → TMZ. Patients with non-resectable glioblastoma (GBM) generally exhibit a poor prognosis, even after XRT/TMZ. Few data are available concerning the predictive value of MGMT promoter methylation in this population. METHODS: This is an observational retrospective study in patients with malignant brain glioma, treated between June 2008 and October 2011 and followed up until April 2012 at the Neurosurgery-Neurotraumatology Unit of the University Hospital of Parma and at the Neurosurgery Unit of IRCCS "ASMN" of Reggio Emilia, Italy. The medical records of an overall number of 174 patients with a newly diagnosed GBM were reviewed. Volumetry analysis of the lesions was performed on pre- and post-operative neuroimaging by Voxar 3D Ebit AET software. The genetic characterization was performed on paraffin embedded tissue from all resected tumours. Isolation of nucleic acids, bisulfite modification of DNA, methylation-specific PCR and sequencing analyses were done mainly on fresh tissue from biopsy withdrawals. Within 3-4 weeks after either biopsy or surgery, patients were assigned to receive XRT/TMZ→TMZ: treatment included XRT (60 Gy in 30 fractions)/TMZ (daily dose of 75 mg/m(2))/TMZ (150-200mg/m(2) per day for 5 days of every 28-day cycle). RESULTS AND DISCUSSION: A total of 55 consecutive patients (23 men, 22 women) fulfilled inclusion criteria consisting of age over 18 years, supratentorial histologically proven primary malignant glioma, complete determination of the MGMT methylation status, no prior history of surgery, XRT and/or chemotherapy, adequate clinical and radiological follow-up no lesser than 6 months. Twenty-three patients underwent neuronavigation needle biopsy (B Group) and thirty-two patients were operated with craniotomy for tumour resection (R Group). The pre-operative mean age was similar between groups (61.7 ± 10.7 vs 60.3 ± 11.8 years in the B and R groups respectively; p>0.05). The B groups showed a slightly lower KPS than the R Group (82.1 ± 17.3 vs 90.3 ± 14.1 respectively; p>0.05). The mean pre-operative volume of the tumour did not differ between groups (46.2 ± 40.2 cm(3) vs 44.1 ± 33.2 cm(3) in the R Group and B Group respectively; p>0.05). The MGMT promoter was methylated in 12 patients (51.2%) of B Group and in 17 patients (53.1%) of R Group. XRT/TMZ → TMZ was accomplished in 11 patients (47.8%) of B Group and in 24 patients (75%) of R Group; in 24/29 methylated patients (82.8%) and in 11/26 unmethylated patients (42.3%). Survival analysis of methylated vs unmethylated tumours was statistically significant (Log Rank Mantel Cox: 0.019 in B Group and 0.023 in R Group). In B Group the mean overall survival (OS) of methylated patients was 11.4 months (IC 95% 6.5-16.4) vs 4.8 months (95% IC, 2.6-7.0) of unmethylated patients. In R Group the mean OS was 21.7 months (95% IC, 16.9-26.6) for methylated patients and 14.0 months (95% IC, 8.5-19.4) for unmethylated patients. At the multivariate Cox regression analysis conducted on the total population (55 patients), XRT and TMZ were found to be predictive of OS. In the R Group, KPS, XRT and TMZ correlated with a better outcome. In the B Group, XRT and MGMT promoter methylation were favourably related with OS. CONCLUSION: MGMT promoter unmethylation has a predominant unfavourable impact on clinical outcomes even in the subpopulation of patients with non-resectable GBM. The unmethylated MGMT promoter status could be considered the main predictor of poor prognosis in biopsied GBM, due to the greater probability of patients not having benefits from adjuvant therapies and not being able to accomplish XRT/TMZ → TMZ. The frameless neuronavigation biopsy technique is safe and effective for predictive evaluation and could help in treatment decision making.

Intraoperative neurophysiological monitoring for intradural extramedullary tumors: why not?

BACKGROUND: While intraoperative neurophysiological monitoring (IOM) for intramedullary tumors has become a standard in neurosurgical practice, IOM for intradural extramedullary tumors (IDEMs) is still under debate. The aim of this study is to evaluate the role of IOM during surgery for IDEMs. METHODS: From March 2008 to March 2013, 68 patients had microsurgery with IOM for IDEMs (31 schwannomas, 25 meningiomas, 6 ependymomas of the cauda/filum terminalis, 4 dermoid cysts and 2 other lesions). The IOM included somatosensory evoked potentials (SEPs), motor evoked potentials (MEPs), and--in selected cases--D-waves. Also preoperative and postoperative neurophysiological assessment was performed with SEPs and MEPs. All patients were evaluated at admission and at follow up (minimum 6 months) with the Modified McCormick Scale (mMCs). RESULTS: Three different IOM patterns were observed during surgery: no change in evoked potentials (63 cases), transitory evoked potentials change (3 cases) and loss of evoked potentials (2 cases). In the first setting surgery was never stopped and a radical tumor removal was achieved (no stop surgery group). In 3 cases of transitory evoked potentials change, surgery was temporarily halted but the tumors were at the end completely removed (stop and go surgery group). In 2 more patients the loss of evoked potentials led to an incomplete resection (stop surgery group). No patients presented a worsening of the pre-operative clinical conditions (at admission 47 patients presented mMCs 1-2 and 21 patients mMCs 3-5, while at follow up 62 patients are mMCS 1-2 and 6 patients mMCs 3-5). CONCLUSIONS: In our series significant IOM changes occurred in 5 out of 68 patients with IDEMs (7.35%), and it is conceivable that the modification of the surgical strategy - induced by IOM - prevented or mitigated neurological injury in these cases. Vice versa, in 63 patients (92.65%) IOM invariably predicted a good neurological outcome. Furthermore this technique allowed a safer tumor removal in IDEMs placed in difficult locations as cranio-vertebral junction or in antero/antero-lateral position (where rotation of spinal cord can be monitored) and even in case of tumor adherent to the spinal cord without a clear cleavage plane.