scholarly journals Predictors of Treatment Response and Survival Outcomes in Meningioma Recurrence with Atypical or Anaplastic Histology

Neurosurgery ◽  
2017 ◽  
Vol 82 (6) ◽  
pp. 824-832 ◽  
Author(s):  
Muhammad O Chohan ◽  
Christopher T Ryan ◽  
Ranjodh Singh ◽  
Ryan M Lanning ◽  
Anne S Reiner ◽  
...  
Keyword(s):  
Treatment Guidelines ◽  
Extent Of Resection ◽  
Cancer Center ◽  
Tumor Control ◽  
Subtotal Resection ◽  
Recurrence Rates ◽  
Risk Of Progression ◽  
Anaplastic Histology ◽  
First Recurrence

Abstract BACKGROUND Recurrence rates for atypical and anaplastic meningiomas range between 9% and 50% after gross total resection and between 36% and 83% after subtotal resection. Optimal treatment of recurrent meningiomas exhibiting atypical/anaplastic histology is complicated because they are often refractory to both surgery and radiation. OBJECTIVE To evaluate clinical determinants of recurrence and treatment-specific outcomes in patients with recurrent meningiomas exhibiting atypical/anaplastic histology at our institution. METHODS A cohort study was conducted using clinical data of all patients treated for meningiomas with atypical/anaplastic histology at first recurrence between January 1985 and July 2014 at a tertiary cancer center. Predictors of second recurrence were analyzed using competing risks regression models. RESULTS Nine hundred eighteen patients with meningioma were screened, of whom 60 (55% female) had recurrent disease with atypical/anaplastic histology at a median age of 58.1 yr at diagnosis. The median follow-up from the time of first recurrence was 36.7 mo, with 32 (53%) patients alive at last follow-up. There was no effect of extent of resection at first recurrence on time to a subsequent recurrence. Inclusion of radiation as primary or adjuvant therapy at first recurrence reduced the risk of progression or subsequent recurrence compared to surgery alone (P = .07). CONCLUSION Treatment of recurrent meningiomas with atypical/anaplastic histology remains challenging. Our data, from one of the largest cohorts, suggest better tumor control with the addition of radiation and challenges the importance of extent of resection at first recurrence. A multicenter effort is needed to confirm these findings and propose treatment guidelines.

scholarly journals Outcomes following myxopapillary ependymoma resection: the importance of capsule integrity

2015 ◽  
Vol 39 (2) ◽  
pp. E8 ◽  
Author(s):  
Mohammed Abdulaziz ◽  
Grant W. Mallory ◽  
Mohamad Bydon ◽  
Rafael De la Garza Ramos ◽  
Jason A. Ellis ◽  
...  
Keyword(s):  
Recurrence Rate ◽  
Adjuvant Radiotherapy ◽  
Extent Of Resection ◽  
Subtotal Resection ◽  
Myxopapillary Ependymoma ◽  
Adjuvant Radiation ◽  
Recurrence Rates ◽  
En Bloc

OBJECT While extent of resection has been shown to correlate with outcomes after myxopapillary ependymoma (MPE) resection, the effect of capsular violation has not been well studied. The role of adjuvant radiation also remains controversial. In this paper the authors' goals were to evaluate outcomes following resection of MPE based on intraoperative capsular violation and to explore the role of adjuvant radiotherapy in cases of capsular violation. METHODS A retrospective review of patients undergoing resection of MPE at 2 academic institutions between 1990 and 2013 was performed. Cases with dissemination at presentation, less than 12 months of follow-up, or incomplete records were excluded. Extent of resection was defined as en bloc if all visible tumor was removed without capsular violation, gross-total resection (GTR) if all visible tumor was removed, but with capsular violation, and subtotal resection (STR) if a known residual was left at the time of surgery. Postoperative MR images were reviewed to confirm the extent of resection. Primary outcomes were progression-free survival (PFS) and overall recurrence rates. The effects of extent of resection, capsular violation, and adjuvant radiotherapy on recurrence rates and PFS were analyzed using Kaplan-Meier statistics. Associations between recurrence and preoperative variables were evaluated using Fisher exact methods and t-tests where appropriate. RESULTS Of the 107 patients reviewed, 58 patients (53% were male) met inclusion criteria. The mean age at surgery was 40.8 years (range 7–68 years). The median follow-up was 51.5 months (range 12–243 months). Extent of resection was defined as en bloc in 46.5% (n = 27), GTR in 34.5% (n = 20), and STR in 18.9% (n = 11). No recurrences were noted in the en bloc group, compared with 15% (n = 3) and 45% (n = 5) in the GTR and STR groups. En bloc resection was achieved most frequently in tumors involving the conus. Twelve patients (20%) underwent adjuvant radiotherapy following either STR or GTR. The overall recurrence rate was 13.8% (n = 8), and the 5-year PFS was 81%. Capsular violation was associated with a higher recurrence rate (p = 0.005). Adjuvant radiotherapy showed a nonsignificant trend of lower recurrence rates (16.7% vs 31.6%, p = 0.43) and longer PFS at 5 years (83.3% vs 49.9%, p = 0.16) in cases of capsular violation. CONCLUSIONS A strong correlation between capsular violation and recurrence was found following removal of MPE and should be assessed when defining extent of resection in future studies. Although the use of adjuvant radiotherapy in cases of capsular violation showed a trend toward improved PFS, further investigation is needed to establish its role as salvage therapy also appears to be effective at halting disease progression.

scholarly journals SURG-03. The effect of surgery on radiation necrosis in irradiated brain metastases: extent of resection and long-term clinical and radiographic outcomes

2021 ◽  
Vol 3 (Supplement_3) ◽  
pp. iii23-iii24
Author(s):  
William Newman ◽  
Jacob Goldberg ◽  
Sergio Guadix ◽  
Samantha Brown ◽  
Anne Reiner ◽  
...  
Keyword(s):  
Radiation Necrosis ◽  
Extent Of Resection ◽  
Comprehensive Cancer Center ◽  
Cancer Center ◽  
Subtotal Resection ◽  
Continuous Variables ◽  
Whole Brain Irradiation ◽  
Full Cohort ◽  
Steroid Dependency

Abstract Objective Radiation therapy is a cornerstone of brain metastasis (BrM) management but carries the risk of radiation necrosis (RN), which can require resection for palliation or diagnosis. We sought to determine the relationship between extent of resection (EOR) of pathologically-confirmed RN and postoperative radiographic and symptomatic outcomes. Methods A single-center retrospective review was performed at an NCI-designated Comprehensive Cancer Center to identify all surgically-resected, previously-irradiated necrotic BrM without admixed recurrent malignancy from 2003–2018. Clinical, pathologic and radiographic parameters were collected. Volumetric analysis determined EOR and longitudinally evaluated perilesional T2-FLAIR signal preoperatively, postoperatively, and at 3-, 6-, 12-, and 24-months postoperatively when available. Rates of time to 50% T2-FLAIR reduction was calculated using cumulative incidence in the competing risks setting with last follow-up and death as competing events. The Spearman method was used to calculate correlation coefficients, and continuous variables for T2-FLAIR signal change, including EOR, were compared across groups. Results Forty-six patients were included. Most underwent prior stereotactic radiosurgery with or without whole-brain irradiation (n=42, 91%). Twenty-seven operations resulted in gross-total resection (59%; GTR). For the full cohort, T2-FLAIR edema decreased by a mean of 78% by 6 months postoperatively that was durable to last follow-up (p<0.05). EOR correlated with edema reduction at last follow-up, with significantly greater T2-FLAIR reduction with GTR versus subtotal resection (p<0.05). There was a trend towards decreased steroid use, from 8mg daily dexamethasone-equivalent (range 2–36) preoperatively to 3mg 12-months postoperatively (range 1–8; p=0.063). Conclusions RN resection conferred both durable T2-FLAIR reduction, which correlated with EOR, and reduced steroid dependency.

scholarly journals Stereotactic radiosurgery for treating meningiomas eligible for complete resection

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Maximilian I. Ruge ◽  
Juman Tutunji ◽  
Daniel Rueß ◽  
Eren Celik ◽  
Christian Baues ◽  
...  
Keyword(s):  
Adverse Events ◽  
Stereotactic Radiosurgery ◽  
Medical Condition ◽  
Local Tumor Control ◽  
Complete Resection ◽  
Neurological Deficits ◽  
Tumor Control ◽  
Recurrence Rates ◽  
Treatment Volume

Abstract Background For meningiomas, complete resection is recommended as first-line treatment while stereotactic radiosurgery (SRS) is established for meningiomas of smaller size considered inoperable. If the patient´s medical condition or preference excludes surgery, SRS remains a treatment option. We evaluated the efficacy and safety of SRS in a cohort comprising these cases. Methods In this retrospective single-centre analysis we included patients receiving single fraction SRS either by modified LINAC or robotic guidance by Cyberknife for potentially resectable intracranial meningiomas. Treatment-related adverse events as well as local and regional control rates were determined from follow-up imaging and estimated by the Kaplan–Meier method. Results We analyzed 188 patients with 218 meningiomas. The median radiological, and clinical follow-up periods were 51.4 (6.2–289.6) and 55.8 (6.2–300.9) months. The median tumor volume was 4.2 ml (0.1–22), and the mean marginal radiation dose was 13.0 ± 3.1 Gy, with reference to the 80.0 ± 11.2% isodose level. Local recurrence was observed in one case (0.5%) after 239 months. The estimated 2-, 5-, 10- and 15-year regional recurrence rates were 1.5%, 3.0%, 6.6% and 6.6%, respectively. Early adverse events (≤ 6 months after SRS) occurred in 11.2% (CTCEA grade 1–2) and resolved during follow-up in 7.4% of patients, while late adverse events were documented in 14.4% (grade 1–2; one case grade 3). Adverse effects (early and late) were associated with the presence of symptoms or neurological deficits prior to SRS (p < 0.03) and correlated with the treatment volume (p < 0.02). Conclusion In this analysis SRS appears to be an effective treatment for patients with meningiomas eligible for complete resection and provides reliable long-term local tumor control with low rates of mild morbidity.

Sphenoorbital meningioma: surgical technique and outcome

2011 ◽  
Vol 114 (5) ◽  
pp. 1241-1249 ◽  
Author(s):  
Soichi Oya ◽  
Burak Sade ◽  
Joung H. Lee
Keyword(s):  
Surgical Technique ◽  
Visual Outcome ◽  
Sphenoid Bone ◽  
Wide Resection ◽  
Tumor Control ◽  
Subtotal Resection ◽  
Total Resection ◽  
Anterior Clinoid Process ◽  
Orbital Wall

Object The aim of this study was to describe the surgical technique used for removal of sphenoorbital meningiomas in the authors' practice and to review the operative outcome. Methods Review of the senior author's practice between 1994 and 2009 revealed 39 patients (mean age 48 years) eligible for this study. Clinical presentation, surgical technique, postoperative outcome, and follow-up data are presented. Surgical technique is detailed, with an emphasis on aggressive removal consisting of drilling of the hypertrophied sphenoid bone, orbital wall, and anterior clinoid process, followed by tumor removal and a wide resection of the involved dura. A simple dural closure without reconstruction of the orbital roof or the lateral wall of the orbit is also described. Results Gross-total resection was achieved in 15 cases (38.5%), near-total resection with small residual in the cavernous sinus or periorbita in 20 cases (51.3%), and subtotal resection in 4 cases (10.3%). Postoperative complications included trigeminal hypesthesia in 9 patients, oculomotor palsy in 3 patients, and seizure in 2 patients. Seven patients had recurrence within the mean follow-up period of 40.7 months. Preoperative visual deficits were present in 21 patients (53.8%). Of these, 14 (66.7%) experienced visual recovery to normal levels postoperatively. Statistical analyses revealed preoperative severe visual deficit and sphenoid bone hypertrophy as an independent risk factor and an independent favorable factor, respectively, for a favorable visual outcome. Proptosis was resolved (≤ 2 mm) in 73.5% of the authors' patients. No patient had postoperative enophthalmos. Conclusions In the authors' practice, surgery for sphenoorbital meningiomas consists of resection of the orbital/sphenoid intraosseous, intraorbital, and intradural tumor components. The authors believe that aggressive removal of the orbital/sphenoid intraosseous tumor is critical for a favorable visual outcome and tumor control. Furthermore, satisfactory cosmetic results can be achieved with simple reconstruction techniques as described.

scholarly journals The Changing Paradigm for the Surgical Treatment of Large Vestibular Schwannomas

2018 ◽  
Vol 79 (S 04) ◽  
pp. S362-S370 ◽  
Author(s):  
Constantin Tuleasca ◽  
Alda Rocca ◽  
Mercy George ◽  
Etienne Pralong ◽  
Luis Schiappacasse ◽  
...  
Keyword(s):  
Functional Outcome ◽  
Residual Tumor ◽  
University Hospital ◽  
Tumor Control ◽  
Subtotal Resection ◽  
Consecutive Series ◽  
Cochlear Function ◽  
Nerve Preservation ◽  
The Past

Objective Planned subtotal resection followed by Gamma Knife surgery (GKS) in patients with large vestibular schwannoma (VS) has emerged during the past decade, with the aim of a better functional outcome for facial and cochlear function. Methods We prospectively collected patient data, surgical, and dosimetric parameters of a consecutive series of patients treated by this method at Lausanne University Hospital during the past 8 years. Results A consecutive series of 47 patients were treated between July 2010 and January 2018. The mean follow-up after surgery was 37.5 months (median: 36, range: 0.5–96). Mean presurgical tumor volume was 11.8 mL (1.47–34.9). Postoperative status showed normal facial nerve function (House–Brackmann I) in all patients. In a subgroup of 28 patients, with serviceable hearing before surgery and in which cochlear nerve preservation was attempted at surgery, 26 (92.8%) retained serviceable hearing. Nineteen had good or excellent hearing (Gardner–Robertson class 1) before surgery, and 16 (84.2%) retained it after surgery. Mean duration between surgery and GKS was 6 months (median: 5, range: 3–13.9). Mean residual volume as compared with the preoperative one at GKS was 31%. Mean marginal dose was 12 Gy (11–12). Mean follow-up after GKS was 34.4 months (6–84). Conclusion Our data show excellent results in large VS management with a combined approach of microsurgical subtotal resection and GKS on the residual tumor, with regard to the functional outcome and tumor control. Longer term follow-up is necessary to fully evaluate this approach, especially regarding tumor control.

Tumor control after surgery for spinal myxopapillary ependymomas: distinct outcomes in adults versus children

2013 ◽  
Vol 19 (4) ◽  
pp. 471-476 ◽  
Author(s):  
William B. Feldman ◽  
Aaron J. Clark ◽  
Michael Safaee ◽  
Christopher P. Ames ◽  
Andrew T. Parsa
Keyword(s):  
Recurrence Rate ◽  
Adjuvant Radiotherapy ◽  
Pediatric Patients ◽  
Cauda Equina ◽  
Extent Of Resection ◽  
Gross Total Resection ◽  
Tumor Control ◽  
Recurrence Rates ◽  
Total Resection ◽  
Who Grade

Object Myxopapillary ependymomas (MPEs) are rare WHO Grade I tumors found in the conus medullaris, cauda equina, and filum terminale. Treatment generally consists of resection with or without adjuvant radiotherapy. Evidence-based guidelines for surgical management are lacking due to the rarity of this tumor. Methods An English-language PubMed search was performed using the key words “myxopapillary” and “ependymoma.” Reports describing fewer than 3 patients or those lacking data on the extent of resection or radiotherapy were excluded. A total of 28 articles describing 475 patients met the authors' inclusion criteria. Patients were grouped by extent of resection and whether or not they underwent adjuvant radiotherapy. Differences in recurrence rates were assessed by chi-square test. Results The overall recurrence rate was 15.5% in patients treated by gross-total resection (GTR) and 32.6% in patients treated by subtotal resection (STR), irrespective of whether they underwent adjuvant therapy (p < 0.001). Regardless of the extent of resection, adjuvant radiotherapy was not associated with a decrease in recurrence rates. The overall recurrence rate was 15.6% in patients who underwent GTR and radiotherapy compared with 15.9% in patients who underwent GTR alone (p = 0.58), and it was 29.3% in patients who underwent STR and radiotherapy compared with 35.1% in those who underwent STR alone (p = 0.53). The difference between recurrence rates for patients who underwent GTR alone versus STR and radiotherapy was statistically significant (p = 0.02). Subgroup analysis demonstrated significantly higher recurrence rates in pediatric patients compared with adults (40.5% vs 23.4%, respectively; p = 0.02). Even in the setting of GTR alone, recurrence rates were higher in pediatric patients (65% vs 7.6%; p < 0.001). Conclusions Gross-total resection alone is associated with decreased recurrence rates compared with STR with or without radiotherapy. The authors' results suggest that treatment goals should include attempted GTR whenever possible. The observation that children benefitted from radiation therapy to a greater extent than did adults suggests that biological differences between tumors in these patient populations warrants more rigorous scientific studies.

Factors affecting outcome following treatment of patients with cavernous sinus meningiomas

2010 ◽  
Vol 113 (5) ◽  
pp. 1087-1092 ◽  
Author(s):  
Michael E. Sughrue ◽  
Martin J. Rutkowski ◽  
Derick Aranda ◽  
Igor J. Barani ◽  
Michael W. McDermott ◽  
...  
Keyword(s):  
Cavernous Sinus ◽  
Postoperative Radiotherapy ◽  
Meta Analysis ◽  
Survival Rates ◽  
Extent Of Resection ◽  
Gross Total Resection ◽  
Cranial Neuropathy ◽  
Tumor Control ◽  
Subtotal Resection ◽  
Total Resection

Object Although there is a considerable volume of literature available on the treatment of patients with cavernous sinus meningiomas (CSMs), most of the data regarding tumor control and survival come from case studies or single-institution series. The authors performed a meta-analysis of reported tumor control and survival rates of patients described in the published literature, with an emphasis on specific prognostic factors. Methods The authors systematically analyzed the published literature and found more than 3000 patients treated for CSMs. Separate meta-analyses were performed to calculate pooled rates of recurrence and cranial neuropathy after 1) gross-total resection, 2) subtotal resection without adjuvant postoperative radiotherapy or radiosurgery, and 3) stereotactic radiosurgery (SRS) alone. Results were expressed as pooled proportions, and random-effects models were used to incorporate any heterogeneity present to generate a pooled proportion. Individual studies were weighted using the inverse variance method, and 95% CIs for each group were calculated from the pooled proportions. Results A total of 2065 nonduplicated patients treated for CSM met inclusion criteria for the analysis. Comparisons of the 95% CIs for recurrence of these 3 cohorts revealed that SRS-treated patients experienced improved rates of recurrence (3.2% [95% CI 1.9–4.5%]) compared with either gross-total resection (11.8% [95% CI 7.4–16.1%]) or subtotal resection alone (11.1% [95% CI 6.6–15.7%]) (p < 0.01). The authors found that the pooled mixed-effects rate of cranial neuropathy was markedly higher in patients undergoing resection (59.6% [95% CI 50.3–67.5%]) than for those undergoing SRS alone (25.7% [95% CI 11.5–38.9%]) (p < 0.05). Conclusions Radiosurgery provided improved rates of tumor control compared with surgery alone, regardless of the subjective extent of resection.

Intracranial Hemangiopericytoma

Neurosurgery ◽  
2013 ◽  
Vol 73 (4) ◽  
pp. 624-631 ◽  
Author(s):  
Amol J. Ghia ◽  
Eric L. Chang ◽  
Pamela K. Allen ◽  
Anita Mahajan ◽  
Marta Penas-Prado ◽  
...  
Keyword(s):  
Overall Survival ◽  
Postoperative Radiotherapy ◽  
Extent Of Resection ◽  
Cancer Center ◽  
Subtotal Resection ◽  
University Of Texas ◽  
Institutional Experience ◽  
Unknown Status ◽  
Meningeal Hemangiopericytoma ◽  
The University

Abstract BACKGROUND: Meningeal hemangiopericytoma (M-HPC) is a rare entity. OBJECTIVE: To characterize our institutional experience in treating M-HPC. METHODS: We reviewed the medical records of patients with M-HPC evaluated at The University of Texas M.D. Anderson Cancer Center between 1979 and 2009. RESULTS: We identified 63 patients diagnosed between 1979 and 2009 with M-HPC treated with surgery alone or with postoperative radiotherapy (PORT). The majority were male (59%) and with a median age of 40.9 years (range, 0-71). Gross total resection (GTR) predominated (n = 31, 49%) followed by subtotal resection (n = 23, 37%) and unknown status (n = 9, 14.3%). PORT was delivered to 39 of the 63 patients (62%). The 5-, 10-, and 15-year overall survival were 90%, 68%, and 28%, respectively. The 5-, 10-, and 15-year local control (LC) were 70%, 37%, and 20%, respectively. The 5-, 10-, and 15-year metastasis-free survival were 85%, 39%, and 7%. PORT resulted in improved LC (hazard ratio [HR] 0.38, P = .008). Radiotherapy (RT) dose ≥60 Gy correlated with improved LC relative to &lt;60 Gy (HR 0.12, P = .045). GTR correlated with improved LC (HR 0.40, P = .03). On multivariate analysis, PORT (HR 0.33, P = .003), GTR (HR = 0.33, P = .008), and RT dose ≥60 Gy (HR 0.33, P = .003) correlated with improved LC. Among those with GTR, PORT resulted in improved LC (HR 0.18, P = .027). Extent of resection and PORT did not correlate with improved overall survival. CONCLUSION: In M-HPC, both PORT and GTR independently correlate with improved LC. PORT improves LC following GTR. We recommend RT dose ≥60 Gy to optimize LC.

Recurrence rates of resected appendix carcinoid tumors: A 20-year experience at Memorial Sloan Kettering Cancer Center.

2016 ◽  
Vol 34 (4_suppl) ◽  
pp. 221-221
Author(s):  
Jennifer Murphy ◽  
Andrew Rosowicz ◽  
Leonard Saltz ◽  
Philip Paty ◽  
Michael P. La Quaglia ◽  
...  
Keyword(s):  
Neuroendocrine Tumors ◽  
Lymph Node Involvement ◽  
Right Hemicolectomy ◽  
Carcinoid Tumors ◽  
Cancer Center ◽  
Single Institution ◽  
Recurrence Rates ◽  
Incidental Appendectomy ◽  
Average Size

221 Background: NETs of the appendix are rare neoplasms most often discovered during incidental appendectomy. Risk of nodal metastases based on single institution series has suggested that appendix carcinoid tumors > 2 cm should undergo a right colectomy. Unlike other tumors, lymph node involvement does not change management given the lack of adjuvant therapies. We sought to evaluate our experience of patients with resected appendix carcinoid, the risk of recurrence, and the benefit of surveillance following resection. Methods: A single institution database of all patients with diagnosis of neuroendocrine tumors was queried for all resected appendix carcinoid tumors. Excluded were patients with large and small cell neuroendocrine tumors, goblet carcinoid, and patients with inaccessible patient records. Results: 88 patients were included from August, 1994 through December, 2013. The mean age at diagnosis was 37.1(9.9-75.8). There were 19 (22%) children (less than 18 years of age) and 69 (78%) adults. Females represented 72% of all patients. All patients had well differentiated tumors. Median follow-up was 2.5 years (1-16.5 years, 45% of which had longer than 3-year follow-up). 43/88 (49%) patients underwent right hemicolectomy (average size 2 cm) and 45/88 (51%) simple appendectomy (average size 0.9 cm). Most patients were followed with CT scans and laboratory evaluations and frequency of surveillance was inconsistent. There were no recurrences (0/88). Ten-year survival was 100%. Conclusions: This is one of the largest series of resected appendix carcinoid reported and no patients recurred. Prognosis was excellent and in the absence of metastatic disease, excessive imaging and/or laboratory testing should be avoided. We question the use of routine right hemocolectomy in these patients.

Tumor Progression Following Petroclival Meningioma Subtotal Resection: A Volumetric Study

2017 ◽  
Vol 14 (3) ◽  
pp. 215-223 ◽  
Author(s):  
Jacob B Hunter ◽  
Brendan P O’Connell ◽  
Matthew L Carlson ◽  
Lola C Chambless ◽  
Robert J Yawn ◽  
...  
Keyword(s):  
Growth Rate ◽  
Tumor Growth ◽  
Tumor Volume ◽  
Extent Of Resection ◽  
Subtotal Resection ◽  
Volumetric Growth ◽  
Petroclival Meningioma ◽  
Petroclival Meningiomas ◽  
The Mean

Abstract BACKGROUND One study has investigated postoperative growth rates following subtotal resection of petroclival meningiomas utilizing linear measurements, which are insensitive to the multidimensional complex growth of meningiomas, to estimate tumor volume. OBJECTIVE To describe petroclival meningioma growth patterns following less-than-complete resection utilizing volumetric analysis and to identify variables associated with tumor progression. METHODS Patients with surgically resected WHO grade I petroclival meningiomas were retrospectively reviewed (1999-2015). Image analysis software was utilized to perform volumetric analyses of tumor size and growth on serial MRI studies. The impact of preoperative and postoperative variables on tumor growth after subtotal resection was analyzed. An increase in tumor volume of at least 20% was defined as “tumor growth.” RESULTS Twenty-three patients had immediate preoperative and serial postoperative MRI studies available for review. The mean preoperative tumor volume was 20.9 cm3 (range 0.4-54.6). The mean extent of resection was 75.5% (range 31.5%-100.0%). At a mean follow-up of 24.8 mo, 12 tumors (66.7%) exhibited radiological tumor growth, while 6 tumors did not change in size. The median annual volumetric growth rate was 2.82 cm3/yr (range –0.34 to 10.1). Extent of resection and immediate postoperative tumor volume were significantly correlated with the annual volumetric growth rate following resection. At last follow-up, 3 (13%) patients required further intervention. CONCLUSION The majority of petroclival meningiomas exhibit growth following subtotal resection. Extent of resection is strongly associated with risk for disease progression following surgery.

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