Subependymal giant cell astrocytoma treatment

Subependymal giant cell astrocytoma treatment

The management of subependymal giant cell astrocytomas (SEGAs) has been traditionally represented by surgical treatment through an open craniotomic approach. Though open surgery still represents a major option in the management of this kind of tumors, the introduction of mTOR inhibitors in the clinical practice, technological advances in neuroendoscopy and the more recent use of Laser interstitial thermal therapy have significantly enlarged the range of available management opportunities.

A thorough review of the literature has been performed. Accordingly, current views in open surgical treatment, medical therapy, endoscopic tumor removal, and new trends (such as laser interstitial thermal therapy) are discussed.

The risk of significant neurological morbidity (5-50%) complicating open surgery has been for a long time representing a main drawback in the management of SEGAs. More recent series report a significant reduction of morbidity and mortality. The mTOR inhibitors have demonstrated efficacy in both warranting a tumor reduction by up to 60% of the tumor size and helping the control of seizures. However, the reported rate of side effects is as high as 30% and tumor recurrence is a documented occurrence at the time of mTOR inhibitor discontinuation. Endoscopic tumor removal has been more extensively considered an option due to the acquisition of new tools. Limits are still represented by tumor size (< 3 cm) and broad attachment of the tumor to the basal ganglia. Laser interstitial thermal therapy (LITT) is the more recently considered option. Though promising, only short follow-up is available so far, while data on medium- and long-term results of this treatment are completely lacking to date.

Surgical treatment remains a mainstay of the management of SEGAs. The indication for an open craniotomic approach should be balanced with an endoscopic tumor removal or LITT according to patient conditions, the presence or not of active hydrocephalus, and extension of the attachment of the tumor to the basal ganglia. The mTOR inhibitors do have a definite role both as primary and as adjuvant treatment, but consistent limitations are represented up to now by a not negligible rate of complications and the uncertainties related to the possibility of tumor recurrence once the medical treatment is discontinued 1).


Laviv et al.reported two cases of recurrent shunt malfunctions in adult TSC patients with protein-secreting SGCTs and describe the complexity of treating such patients with an emphasis on the role mTOR inhibitors may have in their management 2).


SEGAs have been reported to regrow if mTOR inhibitor therapy is stopped, raising the possibility that long-term medication may be required to prevent tumor growth and hydrocephalus. The question of regrowth following medication withdrawal will need to be addressed in more patients to help establish the optimal duration of therapy. The risks of surgery include acute morbidity and the permanent need for ventriculoperitoneal shunting, which must be balanced against the adverse effects of mTOR inhibitors, including immunosuppression (infections, mouth sores), hypercholesterolemia, and the need for chronic drug monitoring. Some additional benefits of mTOR inhibition in patients with tuberous sclerosis complex, however, may include shrinkage of angiofibromas and angiomyolipomas as well as a possible decrease in seizure burden. Recent reports of successful nonsurgical treatment of SEGAs are promising, and it is hoped that further specifics on dosing, duration, and long-term outcome will help patients and physicians to make informed therapeutic choices.Present treatment recommendations for SEGAs include routine surveillance neuroimaging and close clinical follow-up, paying particular attention to signs and symptoms of acute hydrocephalus. If symptoms arise, or if serial neuroimaging demonstrates tumor growth, neurosurgical intervention is recommended. When gross total resection is impossible, rapamycin and everolimus should be considered, but may not offer a durable response.


In a phase 1–2, open-label study in 28 patients with evidence of serial subependymal giant cell astrocytoma growth, the mTOR inhibitor everolimus (Afinitor, Novartis, East Hanover, NJ) was associated with a reduction in SEGA volume and improved quality of life 3).


Arroyo et al. present a seven-year-old boy with a large, symptomatic SEGA which was treated acutely with everolimus.

Everolimus treatment resulted in rapid reduction in tumor size, symptomatic improvement, and decrease in cerebrospinal fluid protein.

Everolimus can effectively reduce tumor size, decrease cerebrospinal fluid protein, and allow successful ventriculoperitoneal shunt placement without the need for surgical resection of a symptomatic SEGA 4).

References

1)

Frassanito P, Noya C, Tamburrini G. Current trends in the management of subependymal giant cell astrocytomas in tuberous sclerosis. Childs Nerv Syst. 2020 Sep 25. doi: 10.1007/s00381-020-04889-9. Epub ahead of print. PMID: 32978642.
2)

Laviv Y, Jackson S, Rappaport ZH. Persistent communicating hydrocephalus in adult tuberous sclerosis patients: a possible therapeutic role for everolimus. Acta Neurochir (Wien). 2015 Feb;157(2):241-5. doi: 10.1007/s00701-014-2309-0. Epub 2014 Dec 19. PubMed PMID: 25524658.
3)

Krueger DA, Care MM, Holland K, et al. Everolimus for subependymal giant-cell astrocytomas in tuberous sclerosis. N Engl J Med 2010;363:1801–1811
4)

Arroyo MS, Krueger DA, Broomall E, Stevenson CB, Franz DN. Acute Management of Symptomatic Subependymal Giant Cell Astrocytoma With Everolimus. Pediatr Neurol. 2017 Jul;72:81-85. doi: 10.1016/j.pediatrneurol.2017.04.008. Epub 2017 Apr 18. PubMed PMID: 28511812.

Multiple sclerosis related trigeminal neuralgia treatment

Multiple sclerosis related trigeminal neuralgia treatment

The optimal treatment for medically refractory trigeminal neuralgia in multiple sclerosis (MS-TN) patients is unknown.

Surgical interventions are less effective for the treatment of MS-related TN compared with classic TN, and higher recurrence rates are observed and is more difficult to manage pharmacologically.

Treatment failure occurs in most of the MS-related TN patients independently of the type of treatment.

Lee et al. compared treatment outcomes between stereotactic radiosurgery (SRS) and radiofrequency ablation (RFA).

They performed a retrospective study of MS-TN patients treated with SRS or RFA between 2002 and 2019. Outcomes included degree of pain relief, pain recurrence, and sensory changes, segregated based on initial treatment, final treatment following retreatment with the same modality, and crossover patients.

Sixty surgical cases for 42 MS-TN patients were reviewed. Initial pain freedom outcomes and rates of retreatment were similar (SRS: 30%; RFA: 42%). RFA resulted in faster onset of pain freedom (RFA: <1 week; SRS: 15 weeks; p < 0.001). SRS patients with pain relief had longer intervals to pain recurrence at 2 years (p = 0.044). Final treatment outcomes favored RFA for pain freedom/off-medication outcomes (RFA: 44%; SRS: 11%; p = 0.031), though RFA resulted in more paresthesia (RFA: 81%; SRS: 39%; p = 0.012). Both provided at least 80% of adequate pain relief. Crossover patients did not have improved pain relief.

SRS and RFA are both valid surgical options for MS-TN. Discussion with providers will need to balance patient preference with their unique treatment characteristics 1).

Microvascular decompression

see Microvascular decompression for trigeminal neuralgia and multiple sclerosis.

Gamma Knife surgery

Between July 1992 and November 2010, 43 cases with more than 1 year of follow-up were operated with GKS for TN related to MS and prospectively evaluated in the Timone University Hospital, Marseille, France. Radiosurgery using the Gamma Knife (model B or C or Perfexion) was performed. A single 4-mm isocenter was positioned at a median distance of 8 mm (range 5.7-14.7) anterior to the emergence of the nerve. A median maximum dose of 85 Gy (range 75-90) was delivered. Results: The median follow-up period was 53.8 months (12-157.1). Thirty-nine patients (90.7%) were initially pain free. Their actuarial probability of remaining pain free without medication at 6 months, 1, 3, 5 and 10 years was 87.2, 71.8, 43.1, 38.3 and 20.5%, respectively, and remained stable till 12 years. The hypoesthesia actuarial rate at 6 months, 1 and 2 years was 11.5, 11.5 and 16%, and remained stable till 12 years. GKS proved safe and effective in this special group of patients 2).

Balloon compression

see Percutaneous balloon compression trigeminal rhizotomy for multiple sclerosis related trigeminal neuralgia.

References

1)

Lee AT, Raygor KP, Elefant F, et al. Comparison of Stereotactic Radiosurgery and Radiofrequency Ablation for Trigeminal Neuralgia in Multiple Sclerosis Patients [published online ahead of print, 2020 Sep 3]. Stereotact Funct Neurosurg. 2020;1-8. doi:10.1159/000509315
2)

Tuleasca C, Carron R, Resseguier N, Donnet A, Roussel P, Gaudart J, Levivier M, Régis J. Multiple Sclerosis-Related Trigeminal Neuralgia: A Prospective Series of 43 Patients Treated with Gamma Knife Surgery with More than One Year of Follow-Up. Stereotact Funct Neurosurg. 2014 Jul 8;92(4):203-210. [Epub ahead of print] PubMed PMID: 25011487.

Handbook of COVID-19 Prevention and Treatment

Handbook of COVID-19 Prevention and Treatment

This handbook is currently available in Chinese, English, Italian, French, Spanish, Japanese, German, Persian and Bahasa Indonesia and will be translated to Arabic soon. Other language versions contributed by volunteers will also be continuously shared. The Resources Sharing Center will continue to launch more anti-epidemic resources and provide more practical suggestions and references for medical staff worldwide.

Link: https://covid-19.alibabacloud.com/

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