Predictor factors for recurrence in atypical meningiomas.

BACKGROUND AND OBJECTIVES: Atypical meningiomas (AMs), World Health Organization (WHO) grade 2, are a group of tumors with uneven and unpredictable clinical behavior. Our aim was to analyze possible tumor recurrence predictors, and to identify factors that improve progression-free survival (PFS). PATIENTS, MATERIALS AND METHODS: Our retrospective study included 81 patients followed up in the Prof. Dr. Nicolae Oblu Emergency Clinical Hospital, Iasi, Romania, between 1 January 2010 and 31 December 2020. The histopathological specimens were reviewed according to the WHO 2021 criteria. Analyses included clinical, imaging, pathological and surgical factors. RESULTS: The tumor recurred in 53.1% of the 81 cases within 60 months of surgery. Tumor location (p<0.000), tumor volume (p<0.010), extent of surgical resection (p<0.000) and dural sinus invasion (p<0.001) were predictive factors of recurrence. Gross total resection (Simpson grade I and II) was achieved in 59.2% of patients. Patients with the tumors located in the brain convexity and volume <26.4 cm³ had better survival rates up to recurrence. PFS showed a significant relationship between Simpson grade I-III and biopsy (p<0.000) and was statistically influenced by tumor volume and location, and dural sinus invasion. CONCLUSIONS: AMs are a heterogeneous group of tumors, and we identified posterior fossa location, volume ≥26.4 cm³, Simpson grade III and IV resection and dural sinus invasion as predictive factors for relapse and a shorter PFS. Whereas certain characteristics provide some prognostic value, future molecular characterizations of AMs are necessary, which will support the clinical decision-making process.

A cases series of endovascular and microsurgical combined treatment of intracranial aneurysms.

OBJECTIVE: Our scientific paper is aimed at describing multimodal treatment of intracranial aneurysms represented by microsurgery and endovascular therapy. PATIENTS, MATERIALS AND METHODS: We report four cases of intracranial aneurysms treated in our Department of Neurosurgery by microsurgery (clipping) and endovascular treatment (coiling), through the joint efforts of a team of highly skilled neurosurgeons. RESULTS: Mixed treatment has been imposed by the complications we were presented with, resulting from either of the two surgical methods employed. CONCLUSIONS: Although endovascular surgery is considered a newer treatment method, favored by many practitioners, and preferred by patients, there are situations where open surgery is still required. There are certain situations were using one of the surgical methods fails and a complementary procedure is required for a secure and successful treatment. The cases reported here will demonstrate the utility of combining the two procedures.

A Case Series of Surgical Resection of Anterior and Posterior Butterfly Glioma Grade 4 via a Minimally Invasive Keyhole Approach.

Surgical resection of infiltrating glial neoplasms has proven to improve quality of life and confer a significant survival benefit. As accumulating evidence cements the role of surgery in grade 4 gliomas, there is a general trend to transition away from traditional large craniotomies to smaller 'keyhole' approaches, which aim to reduce the trauma and complication profiles associated with large exposures. A keyhole approach uses a small craniotomy positioned perfectly to reach at least all the target structures that a conventional approach would reach. We present a case series of operated butterfly gliomas grade 4 patients through keyhole approaches. All three operated patients have better survival than the literature biopsy groups. The resection of butterfly gliomas should be considered in selected cases. For some patients, it is feasible with the technology used nowadays, with improved quality of life and better survival prognosis.

Clinicopathological characteristics and prognostic factors of atypical meningiomas with bone invasion: a retrospective analysis of nine cases and literature review.

BACKGROUND: Meningiomas are the most common primary neoplasms of the central nervous system in adults, arising from the arachnoid cap cells. Thus, grade 2 meningiomas are situated on the border between benignity and malignancy. Among the many prognostic factors that have been investigated in these tumors, bone invasion is one of them. OBJECTIVE: The aim of our study was to identify whether bone invasion influences tumor recurrence and progression-free survival (PFS) in patients with atypical meningiomas (AMs). PATIENTS, MATERIALS AND METHODS: Out of 81 patients with AMs followed over a period of five years, we identified nine patients with bone invasion. We analyzed their demographic, clinical, imaging, and pathological characteristics, such as age, gender, radiological aspects, morphological features, extent of resection, recurrence rate, and PFS over a follow-up period of 60 months. Bone invasion was determined based on preoperative, surgical, and pathological reports. RESULTS: Out of the nine patients with bone invasion, four had convexity meningiomas, four had parasagittal meningiomas and one had a falcine meningioma. Regarding tumor recurrence∕progression, most patients (n=6) recurred within the first 24 months after surgery. Our study showed that the early recurrence/progression of tumor (at 12 months) correlated with extensive presence of malignancy criteria, especially with the presence of 15-18 mitoses∕10 high-power fields, as well as with large foci of spontaneous necrosis, but also with tumor bone infiltration, extensive bone lamellae destruction, and tumor infiltration of adjacent muscle with its atrophy due to tumor compression. Patients with bone invasion had a PFS of 29.3 months, compared to patients without invasion who had a higher PFS (49.3 months). Significant statistical associations were observed between bone invasion and tumor recurrence (p=0.002) and PFS (p=0.004). CONCLUSIONS: Our study emphasizes the importance of a thorough histopathological examination of the surgical specimen, which can provide significant data for the assessment of the progression of an AM [World Health Organization (WHO) grade 2] with bone invasion. AM infiltration in adjacent bone and muscle increases the rate of tumor recurrence and decreases PFS over a follow-up period of 60 months.

Novel titanium-apatite hybrid scaffolds with spongy bone-like micro architecture intended for spinal application: In vitro and in vivo study.

Titanium alloy scaffolds with novel interconnected and non-periodic porous bone-like micro architecture were 3D-printed and filled with hydroxyapatite bioactive matrix. These novel metallic-ceramic hybrid scaffolds were tested in vitro by direct-contact osteoblast cell cultures for cell adhesion, proliferation, morphology and gene expression of several key osteogenic markers. The scaffolds were also evaluated in vivo by implanting them on transverse and spinous processes of sheep's vertebras and subsequent histology study. The in vitro results showed that: (a) cell adhesion, proliferation and viability were not negatively affected with time by compositional factors (quantitative MTT-assay); (b) the osteoblastic cells were able to adhere and to attain normal morphology (fluorescence microscopy); (c) the studied samples had the ability to promote and sustain the osteogenic differentiation, matrix maturation and mineralization in vitro (real-time quantitative PCR and mineralized matrix production staining). Additionally, the in vivo results showed that the hybrid scaffolds had greater infiltration, with fully mineralized bone after 6 months, than the titanium scaffolds without bioactive matrix. In conclusion, these novel hybrid scaffolds could be an alternative to the actual spinal fusion devices, due to their proved osteogenic performance (i.e. osteoinductive and osteoconductive behaviour), if further dimensional and biomechanical optimization is performed.

Tumor recurrence in parasagittal and falcine atypical meningiomas invading the superior sagittal sinus.

OBJECTIVE: Parasagittal and falcine meningiomas are still a challenge in terms of surgical resection. Although maximal safe resection is the main therapeutic approach, numerous postoperative complications can still occur depending on the locations of these tumors. Moreover, previous studies have reported that parasagittal meningiomas have a higher recurrence rate than meningiomas with other locations. PATIENTS, MATERIALS AND METHODS: We retrospectively reviewed 21 patients with parasagittal and falcine atypical meningiomas [World Health Organization (WHO) grade II], nine of whom had their superior sagittal sinus (SSS) invaded by the tumor. We reviewed the demographic information, operative notes, pathological reports, and clinical and imagistic follow-up reports of each patient over a 5-year time span. RESULTS: All the patients were surgically treated, and the tumor removal was grade II according to Simpson's grading system in 47.6% and grade III in 19% of the cases. The SSS was invaded in 42.9% of the patients. No immediate mortality or morbidity was revealed by our study. Tumor recurrence/progression documented on postoperative imaging amounted to 14.3% and 19%, 12 and 24 months after surgery, respectively. Furthermore, 36, 48 and 60 months after the surgery, the recurrence rate remained the same, namely in 9.5% of the cases. The recurrence was higher in patients with SSS invasion than in patients with no SSS invasion. The tumor recurrence was slightly more predominant in women, i.e., 6% higher than in the male group. CONCLUSIONS: In our group of patients with parasagittal and falcine meningiomas, we report a 47.6% Simpson II resection rate and 19% Simpson III resection rate associated with a very low complication rate and no immediately postoperative morbidity and mortality, compared to more aggressive techniques. The recurrence of parasagittal meningiomas predominated after grade III and IV Simpson resection and dural sinus invasion was a negative predictive factor for recurrence. Therefore, the surgery of parasagittal and falcine meningiomas is beneficial, both for tumor control, but also for improving neurological outcome. Aggressive meningioma resection should be balanced with the increased neurosurgical risk.

Are there any correlations between demographic characteristics, tumor location, and Ki-67 labeling index in intracranial atypical meningiomas (WHO grade II)?

Background∕Aim: Atypical meningiomas (AMs) account for about 30% of all meningiomas and it is difficult to predict their behavior. Nevertheless, the identification of protein markers responsible for the regulation of cell proliferation can be helpful. The purpose of this study is to find possible correlations between demographical characteristics of patients with AMs, tumor anatomic location, and intratumoral immunohistochemical (IHC) expression of Ki-67 labeling index (LI). PATIENTS, MATERIALS AND METHODS: We carried out a retrospective review of 29 patients with intracranial AMs [World Health Organization (WHO) grade II] who underwent resection of AMs at "Professor Dr. Nicolae Oblu" Emergency Clinical Hospital, Iasi, Romania, between January 1, 2014 and December 31, 2016. We searched for their demographic characteristics (age and gender) and tumor location from patients' medical files. The histological slides were reviewed in order to assess the Ki-67 LI. RESULTS: Out of the 29 patients analyzed, 51.72% were females having AMs, with a mean Ki-67 LI of 8.6%, and 48.27% were males with AMs, revealing a mean Ki-67 LI of 8.5%. Considering tumor anatomic location, 82.75% were non-skull base AMs (presenting a mean Ki-67 LI of 8.9%) and 17.24% were skull base AMs (showing a mean Ki-67 LI of 8.2%). Although we did not find any statistically significant correlation between gender, age, tumor anatomic localization, and Ki-67 expression, our study revealed that the mean Ki-67 LI for AMs was 8.7% (ranging from 6% to 15%) and was close to values obtained by other authors. In terms of gender distribution, we have noticed that AMs diagnosed in male patients had a mean Ki-67 LI almost equal to that in female patients even though some studies found Ki-67∕MIB-1 LIs significantly higher in male patients than in female patients. Also, we did not find any significant correlation between Ki-67 LI and tumor anatomic location as reported by other studies. CONCLUSIONS: Despite the fact that statistically we could not find any significant correlation regarding patients' gender and age, tumor anatomic location, and Ki-67 LI expressed by AMs, IHC detection of Ki-67 antigen remains an important tool in addition to routine histological evaluation, which can be used to predict tumor behavior of meningiomas.

The History of Arachne Through Historic Descriptions of Meningiomas with Hyperostosis: From Prehistory to the Present.

BACKGROUND: Intracranial meningiomas are brain tumors that have probably been known the longest, largely because of the occasional production of grotesque cranial deformities that have attracted the attention and interest of humankind. Because of the tendency of some intracranial meningiomas to cause skull deformation and thickening, these tumors have given rise to various speculations and theories related to their origin, starting in prehistoric times up to the present. METHODS: From the Steinheim skull and "pharaonic meningiomas" to the first meningioma monograph and the first explanations of Harvey Cushing regarding the mechanism of hyperostosis, this review aims to weave again the story of Arachne. We identify the main contributors who have tried to understand and explain the tendency of some of these tumors to cause hyperostosis or other skull bone involvements. CONCLUSIONS: The contribution of neurosurgeons or pathologists over the centuries is of undeniable importance and is the basis for understanding future molecular mechanisms.

Correlations between histological subtypes and neurocognitive assessment of language area tumors. Our 43 case series and review of the literature.

BACKGROUND: Brain tumor location is related with specific, focal neurological impairment, but also with more diffuse, generalized and subtitle neurocognitive dysfunctions. For a better evaluation of these cases, we need a specific battery of tests. Beside the impact of preoperative status on surgical decision, the quantification of postoperative function alteration is essential in neurorehabilitation. PATIENTS, MATERIALS AND METHODS: We proposed a battery of tests to assess the neurocognitive function, with an accent on language adapted to Romanian population. The 43 cases included in the study were tested preoperatively, seven days postoperatively and at one month, and correlated with the images and histological results. RESULTS: At admission, from all participants, 11.6% were affected across all measured items and 6.9% on none of them. A rate of impairment significantly higher, four or more items, was observed in glioblastoma (GB) cases (23.3%) in contrast with low-grade glioma (LGG) (0%), meningioma (0%) and metastases (6.9%). From all cases, we performed seven awake craniotomies. At one-month evaluation, general decrease in neurocognitive function was observed in 20.93% cases, among them 88.88% being GB and favorable outcome in 32.55% patients with dominance of LGG and meningioma cases. CONCLUSIONS: A neurocognitive assessment of brain tumor patients is important for preoperative and postoperative evaluation and secondary adjustment of the surgical resection in order to improve or, at list, meantime the initial status. The role and the link between the histological type and tests alteration were observed. The results can be used for a better understanding and management of language area tumors.

Longer survival of a patient with glioblastoma resected with 5-aminolevulinic acid (5-ALA)-guided surgery and foreign body reaction to polyglycolic acid (PGA) suture.

In recent years, there is a growing evidence that using 5-aminolevulinic acid (5-ALA)-guided resection of a cerebral glioblastoma, associated with chemoradiotherapy determine a prolonged survival of these patients, even though this period do not exceed 15 months. 5-ALA is a natural biochemical precursor of heme that is metabolized to fluorescent porphyrins, particularly protoporphyrin IX (PPIX) and no foreign reaction were noted until now. However, foreign body reaction developing in neurosurgery is documented in a few number of cases to suture material, surgical hemostatic material, or surgical glove starch, but up to now we could not find any article about granulomatous inflammation to polyglycolic acid (PGA) suture after brain tumor resection. Here we present a case of a delayed foreign body granuloma to PGA suture diagnosed after 10 months following fluorescence-guided surgery with 5-ALA for resection of a cerebral glioblastoma that was difficult to diagnosis both clinically and on magnetic resonance imaging (MRI). Moreover, the survival time was longer. We correlate the appearance of foreign body granuloma with the patient's persistent pre- and postoperative lymphocytosis. We also suggest that the chronic inflammation inhibited the proliferation of any tumoral cells which could remain in the tumor bed because we did not noticed on serial MRI scans a rapidly tumor growth during the first 10 months after the initial surgery as we have expected to be for a glioblastoma.

The Role of OsiriX Based Virtual Endoscopy in Planning Endoscopic Transsphenoidal Surgery for Pituitary Adenoma.

AIM: Virtual endoscopy (VE) is the navigation of a 3D model reconstructed from radiological image data. The aim of this paper is to evaluate the role and accuracy of the virtual endoscopy realized using commercially available software, OsiriX, as a method of planning of surgical interventions. MATERIAL AND METHODS: The computed tomographies of 22 patients with pituitary adenomas proposed for endoscopic approach were reconstructed using OsiriX. VE was performed prior to surgery to assess the surgical corridor and particular anatomy. We evaluated the following landmarks: inferior and middle turbinate, sphenoid ostia (SO), choanal arch (Ch), sphenoethmoidal recess (SER), sphenoid septa, sella turcica, carotid prominences and opticocarotid recesses (OCR). The intraoperative endoscopic images were reviewed and compared with the virtual images. RESULTS: The virtual images had a good resemblance with the actual surgical images. All the structures from the nasal cavity were identified and had a perfect matching except the SO which was identified in 8 cases in VE vs. 12 intraoperative. All the structures from the sphenoid sinus were identified with perfect matching except the ipsilateral carotid prominence (14 in VE vs. 10 intraoperative) and the contralateral carotid prominence (16 in VE vs. 18 intraoperative). The VE could not show the state of the sellar floor and did not offer any information about the sellar content. CONCLUSION: VE realized in OsiriX represents an affordable alternative to the specially designed systems, offering reliable data and good quality images that are useful for the preoperative planning, but some limitations are present such as inability to obtain additional information in cases where the sphenoid sinus is fully occupied by tumor or not aerated, inability to clearly differentiate between structures at the level of the sella, and impossibility to simulate working instruments.

Using Intraoperative Ultrasonography for Spinal Cord Tumor Surgery.

BACKGROUND: Our aim was to evaluate the usefulness of modern intraoperative ultrasonography (iUS) in the resection of a wide variety of spinal intradural pathologic entities. METHODS: We evaluated patients with spinal cord disease treated between January 2006 and September 2015. Intraoperative standard B-mode images were acquired using a 3.5-MHz to 12-MHz ultrasonographic probes (linear and curvilinear) on various ultrasound machines. The benefits and disadvantages of iUS were assessed for each case. RESULTS: A total number of 158 intradural spinal lesions were operated on using iUS. Of these, 107 lesions (68%) were intradural extramedullary and 51 (32%) were intramedullary. All lesions were clearly visible using the ultrasound probe. The high-frequency linear probes (10-12 MHz) provided a better image quality compared with lower-frequency probes. Color and power-angiography modes were helpful in assessing the vascularization of the tumors and location of the major vessels in the vascular lesions. DISCUSSION: We document how iUS was used to facilitate safe and efficient spinal tumor resection at each stage of the operation. iUS was beneficial in confirmation of tumor location and extension, planning myelotomy, and estimation of degree of resection of the intramedullary tumors. It was particularly helpful in guiding the approach in redo surgeries for recurrent spinal cord tumors. CONCLUSIONS: iUS has a fast learning curve and offers additional intraoperative information that can help improve surgical accuracy and therefore may reduce procedure-related morbidity.

Cerebral venous etiology of intracranial hypertension and differentiation from idiopathic intracranial hypertension.

This study presents the characteristics that distinguish between idiopathic intracranial hypertension (ICH) and ICH caused by intracranial vascular damage. Twenty-one patients with ICH were included in this study. The analysis of the symptomatology correlated with the values of intracranial pressure, and the imaging findings revealed significant differences between these two types of ICH. ICH caused by intracranial venous vascular damage is named vascular ICH. Vascular ICH has a known etiology, such as cerebral vascular illness, and a relatively rapid increase in intracranial pressure of approximately 21 cmH2O and imaging findings show characteristic images of thrombosis or stenosis of the intracranial venous system, while all brain images (computed tomography, magnetic resonance imaging, angio-magnetic resonance imaging) are normal in idiopathic ICH. The treatment of vascular ICH is etiologic, pathogenic, and symptomatic, but that of idiopathic ICH is only symptomatic.

One-step endovascular treatment of bilateral traumatic carotid-cavernous fistulae with atypical clinical course.

Traumatic carotid-cavernous fistula (TCCF) is a rare neurovascular pathologic entity. The bilateral form occurs even rarer and given the potential risk for both optic tracts presents an urgent indication for quick and effective treatment. We present a patient with a bilateral Barrow type A TCCF with a fulminant development of symptoms, who was successfully treated with bilateral detachable balloons in a single session endovascular procedure. The patient experienced complete relief of symptoms, however the complete neurological deficit in the left optic nerve was persistent.

A practical grading system of ultrasonographic visibility for intracerebral lesions.

BACKGROUND: Intraoperative ultrasound for intracranial neurosurgery was largely abandoned in the 1980s due to poor image resolution. Despite many technological advances in ultrasound since then, the use of this imaging modality in contemporary practice remains limited. Our aim was to evaluate the utility of modern intraoperative ultrasound in the resection of a wide variety of intracranial pathologies. METHODS: A total of 105 patients who underwent intracranial lesion resection in a contiguous fashion were prospectively included in the study. Ultrasound images acquired intraoperatively were used to stratify lesions into one of four grades (grades 0-3) on the basis of their ultrasonic echogenicity and border visibility. RESULTS: Forty-two out of 105 lesions (40 %) were clearly identifiable and had a clear border with normal tissue (grade 3). Fifty-five of 105 lesions (52 %) were clearly identifiable but had no clear border with normal tissue (grade 2). Eight of 105 lesions (8 %) were difficult to identify and had no clear border with normal tissue (grade 1). None (0 %) of the lesions could not be identified (grade 0). High-grade gliomas, cerebral metastases, meningiomas, ependymomas, and haemangioblastomas all demonstrated a median ultrasonic visibility grade of 2 or greater. Low-grade astrocytomas and oligodendrogliomas demonstrated a median ultrasonic visibility grade of 2 or less. CONCLUSION: Intraoperative ultrasound can be of tremendous benefit in allowing the surgeon to appraise the location, extent, and local environment of their target lesion, as well as to reduce the risk of preventable complications. We believe that our grading system will provide a useful adjunct to the neurosurgeon when deciding for which lesions intraoperative ultrasound would be useful.

Intraoperative ultrasound in neurosurgery - a practical guide.

Intraoperative ultrasound (iUS) provides low-cost real-time imaging that is simple and rapid to use. Recent advances in probe technology, image fusion, 3D techniques and contrast have led to significant improvements in image quality. This article provides an overview of the current uses of iUS, including technical advice for practical use, and future directions.