Endoscopic endonasal surgery to treat intrinsic brainstem lesions: correlation between anatomy and surgery.

OBJECTIVE: The endoscopic endonasal approach (EEA) has been proposed as an alternative in the surgical removal of ventral brainstem lesions. However, the feasibility and limitations of this approach to treat such pathologies are still poorly understood. This study aimed to report our experience in five consecutive cases of intrinsic brainstem lesions that were managed via an EEA, as well as the specific anatomy of each case. METHODS: All patients were treated in a single center by a multidisciplinary surgical team between 2015 and 2019. Before surgery, a dedicated anatomical analysis of the brainstem safe entry zone was performed, and proper surgical planning was carried out. Neurophysiological monitoring was used in all cases. Anatomical dissections were performed in three human cadaveric heads using 0° and 30° endoscopes, and specific 3D reconstructions were executed using Amira 3D software. RESULTS: All lesions were located at the level of the ventral brainstem. Specifically, one mesencephalic cavernoma, two pontine ca- vernomas, one pontine gliomas, and one medullary diffuse midline glioma were reported. Cerebrospinal fluid leak was the major complication that occurred in one case (medullary diffuse midline glioma). From an anatomical standpoint, three main safe entry zones were used, namely the anterior mesencephalic zone (AMZ), the peritrigeminal zone (PTZ, used in two cases), and the olivar zone (OZ). Reviewing the literature, 17 cases of various brainstem lesions treated using an EEA were found. CONCLUSIONS: To our knowledge, this was the first preliminary clinical series of intrinsic brainstem lesions treated via an EEA presented in the literature. The EEA can be considered a valid surgical alternative to traditional transcranial approaches to treat selected intra-axial brainstem lesions located at the level of the ventral brainstem. To achieve good results, surgery must involve comprehensive anatomical knowledge, meticulous preoperative surgical planning, and intraoperative neurophysiological moni- toring.

Long-term remission and recurrence rate in a cohort of Cushing's disease: the need for long-term follow-up.

OBJECTIVE: Transsphenoidal surgery is the procedure of choice in Cushing disease (CD), with immediate post-operative remission rates ranging between 59 and 94% and recurrence rates between 3 and 46%, both depending upon the definition criteria and the duration of the follow-up. Our aim was to assess the rate of remission, recurrence and persistence of the disease after the first treatment and to identify predictors of remission in the CD population of our center. METHODS: Retrospective cohort study of the patients diagnosed of CD and with follow-up in our center between 1974 and 2011. We analyzed 41 patients (35 women and 6 men) with a mean age at diagnosis of 34 ± 13 years. The mean follow-up was 14 ± 10 years (range 1-37 years) and the median of follow-up period was 6.68 years. RESULTS: Thirty-five (85.4%) patients underwent transsphenoidal surgery as first treatment option. Histopathological evidence of a pituitary adenoma was registered in 17 (48.5%) patients. Thirty-two (78%) patients achieved disease remission after the first treatment, 21 (65.6%) of them presented disease recurrence. Persistent disease was observed in 9 (22%) patients. Twelve (29.3%) subjects developed post-surgical adrenal insufficiency, 7 of which (70%) achieved stable remission. Two parameters were found to be significant predictors of remission after the first treatment: age at disease diagnosis and the development of adrenal insufficiency (cortisol <3 µg/dl) in the immediate post-operative state. CONCLUSIONS: We report a high recurrence rate, at least partially attributable to the long follow-up time. Early post-surgery adrenal insufficiency predicts remission. Hypopituitarism was also very prevalent, and strongly associated with radiotherapy. These results lead us to the conclusion that CD needs a life-long strict follow-up.

The ventral route to intracranial aneurysm: from the origin towards modern transsphenoidal surgery. An historical review and current perspective.

OBJECTIVE: A review of the main studies that have explored the use of the ventral pathway for treatment of intracranial aneurysms,including the recent reported extended transsphenoidal approaches. METHODS: A comprehensive literature review was performed using the PubMed database. We recovered 48 cases of cerebral aneurysms, approached via the transcervical-transclival, transoral-transclival, transfacial-transclival ventral pathways and the extended transsphenoidal route. The overall rates of complications and surgical success were evaluated and compared for both traditional ventral and transsphenoidal approaches. RESULTS: For traditional routes, the overall complications and surgical success rates were 74% (26/35) and 87% (13115), respectively.For extended transsphenoidal approaches were 44% (4/9) and 78% (7 /9), respectively. CONCLUSION: Our paper is a reconnaissance of what has been done via "the anterior route" and a notification of the existence of this "surgical window': Present and future of cerebral aneurysm treatment is represented by the endovascular technique. A few selected cases in specialized centers, where transsphenoidal approaches with the aid of the endoscope are routinely performed,may be treated with such techniques alone or in combination with other different procedures. Further studies in large numbers of patients will be required to validate the full benefit of this approach.

Endoscopic endonasal surgery for skull base tumours: technique and preliminary results in a consecutive case series report.

BACKGROUND: The introduction of the endoscope in transsphenoidal surgery has allowed access to lesions located in complex regions of the skull base under direct visual control. With the application of this technique, our group started treating pituitary tumours and from 2009 onwards began treating skull base lesions through extended endoscopic endonasal approaches. The AIM OF THE PRESENT STUDY is to report our experience with extended endoscopic approaches. Indications, results, limitations and complications of this new technique are also discussed. MATERIAL AND METHODS: From January 2007 to January 2012, the endonasal approach was used in 40 patients with different cancerous lesions. RESULTS: Total tumour removal, as assessed by postoperative magnetic resonance imaging, occurred in 30/ 40 patients (75%), but in 10 patients only partial removal was possible. Major complications, including cerebrospinal fluid leak, were observed in 5/40 patients (8%). One patient died 3 months after surgery due to a severe systemic sepsis. CONCLUSION: The extended endoscopic endonasal approach could be used as a minimally invasive and innovative technique for the removal of selected skull base lesions.

[Cerebrovascular accident with haemorrhagic transformation in a patient on antiplatelet treatment subjected to surgery of a hypophyseal macroadenoma]. / Accidente cerebrovascular con transformación hemorrágica en una paciente con tratamiento antiagregante intervenida de macroadenoma hipofisario.

The case is presented of a 51 year-old woman, proposed for endoscopic endonasal transsphenoidal resection of a hypophyseal macroadenoma diagnosed in the context of a stroke suffered 10 weeks before the date of the surgery. During this time, she had been treated with antiplatelet drugs, which were withdrawn 5 days before the surgery. The surgical procedure was performed without any incidents. On the second day after the surgery, the patient had an ischaemic infarction of the left cerebellar hemisphere, with signs of hydrocephaly and a posterior haemorrhagic transformation, with brain death 5 days after the operation. There are no definitive guidelines on the use of antiplatelet drugs in the perioperative period of neurosurgery. Also, there is no agreement as regards the waiting time between a cerebrovascular event and surgery, it appears that between 4 and 12 weeks would be the most advisable. The importance of an individual assessment of each patient before surgery is emphasised, as well as a review of the antiplatelet management of the patient with a risk of thrombosis in the context of neurosurgery, and their possible postoperative complications.

Neurosurgeon-otolaryngologist collaboration in endonasal approaches to the clivus and suprasellar region.

Lesions in the clivus and suprasellar region are rare but challenging pathologies for physicians. The most common tumours are chordomas and chondrosarcomas, but a wide variety of histopathological tumours can be found in these areas. Their deep location in the midline and their close relationship to important neurovascular structures frequently make total removal difficult. Neurosurgeons are often required to perform aggressive external-approach surgical therapy, which is usually associated with high levels of morbidity and a discouraging tendency for recurrence during long-term follow-up. Fortunately, over the past few years, close collaboration between otorhinolaryngologists and neurosurgeons has led to the development of minimally invasive surgery along the entire neuraxis, with endoscopy being used as the primary visualisation tool. This has been further augmented by the concept of team surgery: ENT surgeons and neurosurgeons working simultaneously throughout all phases of the surgery (approach, resection, and reconstruction). This concept has also changed the surgical approach as a whole, making the endonasal route the main approach for treating these types of lesions in carefully selected patients and external approaches the second-place option. The endonasal approach has revolutionised skull base surgery as it enables less aggressive surgery (reaching deep-seated structures without the need for craniotomy and brain retraction). It is therefore associated with lower morbidity and an absence of visible scars, with encouraging initial oncological prognosis. The aims of this paper are to describe the anatomical landmarks for this approach, to relate our experiences and to provide a literature review.

[Experience with the proseal laryngeal mask in ventriculoperitoneal shunting]. / Experiencia con el uso de la mascarilla laríngea Proseal en pacientes sometidos a cirugía de derivación ventrículo peritoneal.

OBJECTIVE: To describe the use, utility, safety, and effectiveness of the Proseal laryngeal mask for airway management in patients undergoing ventriculoperitonea shunting. PATIENTS AND METHODS: We retrospectively reviewed the records of all patients in whom the Proseal laryngeal mask was used during ventriculoperitoneal shunting between January 2006 and October 2009. Patient demographic characteristics, airway assessments, type of anesthesia, quality of ventilation, and perioperative complications were recorded. RESULTS: Of the 43 patients included, 8 (18.6%) had at least 1 difficult airway criterion. We were able to insert the Proseal laryngeal mask in all patients. Ventilation was optimal in 39 (91%) patients, with maintenance of end-expiratory carbon dioxide pressures between 35 and 40 mm Hg and airway pressures above 25 cm H2O throughout the procedures. Air leaks developed in 3 cases (7%) when the patient was placed in a lateral-cervical position for surgery; these patients required orotracheal intubation before surgery could begin. Mean duration of surgery was 53 minutes. Awakening occurred without incident in all cases. CONCLUSIONS: The Proseal laryngeal mask is useful for airway management in patients undergoing ventriculoperitoneal shunting. Due to the forced position of the neck, however, it may be necessary to reposition the mask or even proceed to orotracheal intubation in some cases. As is the case for other advanced uses, experience with the device is necessary. Material for managing a difficult airway should be on hand.

[Intraoperative videoangiography using green indocyanine during aneurysm surgery]. / Videoangiografía intraoperatoria con verde de indocianina durante la cirugía de aneurismas cerebrales. Experiencia inicial en 10 intervenciones quirúrgicas.

OBJECTIVE: The authors' objective is to report the initial appreciations on the use of the intraoperative near-infrared indocyanine green videoangiography during aneurysm surgery in our center. METHOD: 10 surgical procedures have been made in 9 patients, 5 males and 4 females between 27 and 61 years old with an average of age of 49 years during a time of 10 months between March, 2008 and January, 2009. 10 surgical procedures were performed and 11 aneurysms were clipped. Intravenous indocyanine green and surgical microscope Leica OH4 with module of vascular fluorescence intraoperating Leica FL800, with camera infrared Sony (Heerbrugg-Switzerland) were used. The information offered by this technique during the intervention is compared with the images of the postoperative angiography performed during the first 24 hours. The partial or complete occlusion and the respect to the near vessels were evaluated. RESULTS: The findings of the intraoperative videoangiography were the complete occlusion and absence of complications in all the cases. These results corresponded completely with the postoperative results of the angiography postoperative, except in a case where the angiography demonstrated vasoespasmo moderate without clinical repercussion that during the videoangiografía intraoperatoria was not perceived. Clinically no patient presented neurological added deficits. CONCLUSIONS: The intraoperative videoangiography is a tool of easy application that offers valuable information as for the complete occlusion of the aneurysm and the permeability of the adjacent vessels.

[Prospective comparative study on 50 patients between microsurgical sublabial transsphenoidal approach and endoscopic endonasal transsphenoidal approach]. / Comparación del abordje transesfenoidal microquirúrgico frente al abordaje endonasal transesfenoidal endosócpico. Estudio prospectivo de 50 pacientes.

OBJECTIVE: Compare the standard transsphenoidal sublabial microscopic approach with the endoscopic transsphenoidal approach concerning the tumoral invasiveness and resection, complications of the approaches and time of post operative hospitalisation. MATERIAL AND METHODS: We realized a prospective, non randomised study with 50 patients. They were operated between 2002 and 2006. All the patients had sellar lesions with different grades of invasiveness of the cavernous sinus as classified by Knosp. The variables included in our study were tumoral invasiveness and operative resection (total, subtotal and partial), optic nerve lesion, postoperative panhypopituitarism, CSF fistula, cranial nerves deficits, epistaxis, meningitis, diabetes insipidus and carotid artery lesion. Our series included 27 males and 23 females ranging from 19 to 80 years old (48 mean). In 23 patients we used the standard sublabial microscopic approach (two patients were excluded) and for 25 patients we used the endoscopic approach. The mean follow up was of 12 months. RESULTS: In our experience the endoscopic technique presents a higher percentage of total resection comparing to the sublabial microscopic approach (60% versus 34.8%) and higher percentage of subtotal resections (32% versus 26%) with a statistical significant difference (p=0.033). The time of hospitalisation was significant shorter for the endoscopic approach group (p=0.001), diminishing by half of the time (3 days) of the microscopic approach group. Concerning the tumoral invasiveness and complications we did not appreciate any significant dissimilarity. We appreciated that a higher grade of invasiveness augments by 3.59 the risk of an unsuccessful surgery. DISCUSSION AND CONCLUSION: In our experience the endoscopic technique may favour a better tumoral resection and shorter time of hospitalisation. We did not appreciate differences concerning the complications.

[Diagnostic and therapeutic difficulties in neurocysticercosis: presentation of 6 cases and review of the literature]. / Dificultades diagnósticas y terapéuticas en la neurocisticercosis: presentacion de 6 casos y revisión de la literatura.

INTRODUCTION: The incidence of neurocysticercosis (NCC) is increasing currently in developed countries due to the migration movements from endemic countries. Due to NCC polymorphism, treatment would be individualized in each case. Countries not used to this disease have to deal with. GOALS: To set up diagnostic and therapeutic guidelines in all sorts of NCC and choose the correct treatment would be challenging. PATIENTS AND METHODS: To perform a descriptive and retrospective analysis of six cases of NCC seen in the Neurosurgery Department of the Hospital Clinic de Barcelona from 1992 to 2000 (both included). We have performed a revision of the literature about diagnostic and therapeutic methods. DISCUSSION: Definitive or probable diagnosis of NCC is based on clinical, imaging, immunological, and epidemiological criteria. In patients with inactive disease only symptomatic treatment is indicated. In active parenchymal forms there are not consensus if antiparasitic treatment is indicated. However, in extraparenchymal active disease aggressive treatment with antiparasitic agents and steroids is recommended. In cases of intracranial hypertension, neurological deficits or hydrocephalus surgery is the treatment of choice.

[Predictive value of the Knosp classification in grading the surgical resection of invasive pituitary macroadenomas. A prospective study of 23 cases]. / Valor predictivo de la clasificación de Knosp en el grado de resección quirúrgica de los macroadenomas invasivos. Estudio prospectivo de una serie de 23 casos.

OBJECTIVE: To evaluate our experience regarding the treatment of pituitary macroadenomas with cavernous sinus invasion in a series of 23 cases of transphenoidal resection. MATERIALS, METHODS AND RESULTS: Twenty two patients, fifteen males and seven females, with ages ranging from 27 to 75 (mean of 48), were operated under protocol by a single surgeon between May of 2002 and December of 2004. Preoperatively all lesions were diagnosed by MRI and staged according to the Knosp classification. All tumors had extension to one or both cavernous sinuses. Four patients were considered to be grade 1, two grade 2, one grade 3 and sixteen grade 4. Twenty three operations were performed on twenty-two patients. Twenty cases were the standard transsphenoidal approach, and three were endoscopic. Postoperatively, the excision was classified as Complete or Total, Subtotal or Partial. Mean follow up was 15 months. The variables considered for analysis include invasion and resection grades. All six patients with graded 1 and 2 lesions and two patients with grade 4 lesions underwent a complete resection. Subtotal (greater than 80%) excision was achieved in one patient with a grade 3 tumor and six patients with grade 4 tumors. The remaining seven patients with grade 4 adenomas had a Partial (less than 80%) excision. We compare de resection grade versus invasion grade with exact Fisher test. And there is not estadistical difference (p=0.12). CONCLUSION: The Knosp classification alone cannot predict the behavior of these tumors. In our experience, despite tumor extension to the cavernous sinus, pituitary macroadenomas can be safely resected with low morbidity and mortality.