Natural history, evaluation, and management of intracranial vascular malformations

Management of intracranial cavernous malformation in pediatric patients

OBJECTIVE

Cavernous malformations (CMs) are vascular malformations affecting any part of the central nervous system. CMs in the pediatric age group are known to be different from those of adults both in origin and clinical characteristics. In this paper, we report our experience in managing CMs in pediatric patients.

MATERIALS AND METHODS

Between January 1994 and December 2006, 33 patients younger than 20 years of age with intracranial CMs were treated with microsurgery or radiosurgery. We retrospectively reviewed the presentation and treatment of these 33 patients (18 boys and 15 girls; average age 11.6 years).

RESULTS

The most common symptom at presentation was seizure (19 children, 57.6%). The most common type of CM, classified on the basis of magnetic resonance imaging, was type II (18, 54.5%). The supratentorial compartment was the most frequent location (27, 71.8%), and only six CMs (18.2%) were observed in the infratentorial compartment. Microsurgery was performed on 25 patients (75.8%), and radiosurgery was performed on eight patients (24.2%). The overall post-treatment results were positive. Only two children (6.1%) had persistent presurgical neurological signs, although the treatment ameliorated them. No progression of the preoperative neurological signs or onset of new neurological deficits was seen in any of the patients. In our patient group, the microsurgical removal of CMs resulted in the prevention of recurrent hemorrhage and the control of seizure disorders in all cases.

CONCLUSIONS

Our results suggest that pediatric patients with symptomatic CMs should be treated surgically because of the risk of recurrent hemorrhaging and the general benefits of CM removal.

Post-traumatic pulsatile tinnitus: the hallmark of a direct carotico-cavernous fistula

Following trauma to her right frontal region, a 68-year-old woman suffered bilateral, benign, paroxysmal, positional vertigo and a left-sided, longitudinal petrosal bone fracture, with secondary facial palsy and ossicular luxation. From the onset, the patient complained of pulsatile, left-sided tinnitus. After eight weeks, she developed left-sided ocular symptoms, progressing from conjunctival hyperaemia and orbital oedema to an abducens nerve palsy, and ultimately to heart failure.

The case and the final diagnosis of carotico-cavernous fistula are discussed. Guidelines are proposed for a diagnostic approach to pulsatile tinnitus and for the optimal management of patients presenting with pulsatile tinnitus associated with ocular symptoms.

Surgical management of dural arteriovenous fistulas with transosseous arterial feeders involving the jugular bulb

Dural arteriovenous fistulas located in the vicinity of the jugular foramen are complex vascular malformations and belong to the most challenging skull base lesions to treat. The authors comprehensively analyze multiple features in a series of dural arteriovenous fistulas with transosseous arterial feeders involving the jugular bulb. Four patients who underwent surgery via the transcondylar approach to treat dural arteriovenous fistulas around the jugular foramen were retrospectively reviewed. Previously, endovascular treatment was attempted in all patients. The success of the surgical treatment was examined with postoperative angiography. Complete obliteration of the dural arteriovenous fistulas (DAVFs) was achieved in three patients, and significant flow reduction in one individual. All patients had a good postoperative outcome, and only one experienced mild hypoglossal nerve palsy. Despite extensive bone drilling, an occipitocervical fusion was necessary in only one patient with bilateral lesions. The use of an individually tailored transcondylar approach to treat dural arteriovenous fistulas at the region of the jugular foramen is most effective. This approach allows for complete obliteration of the connecting arterial feeders, and removal of bony structures containing pathological vessels.

[Transarterial embolisation of intracranial dural arteriovenous malformations with ethylene vinyl alcohol copolymer (Onyx18)]

OBJECTIVE

To report our recent experience in transarterial embolisation of dural arteriovenous malformations (DAVM) using a new liquid embolic agent, Onyx18.

PATIENTS AND METHODS

6 patients were enrolled in this series. Clinical presentation was separated into 2 groups: aggressive (n=2), non aggressive (n=4). The DAVM was located at the superior sagittal sinus (n=1), at the transverse sinus (n=2), at the condylian canal (n=1), in the lesser sphenoid wing region (n=1), and in the tentorium region (n=1). The DAVM drained directly into a condylian or a cortical vein for three patients and into a venous sinus with cortical venous reflux for the three others. In this latter situation, the sinus was anatomically excluded from the normal brain venous drainage.

RESULTS

A full brain angiogram including both internal carotid arteries, both external carotid arteries and ipsilateral vertebral artery, was performed before and after each treatment. The feeder chosen after a selective catheterisation for Onyx18 injection was always meningeal. Each treatment consisted of a single Onyx injection after one unique feeder catheterisation. Complete anatomical exclusion of the DAVM was achieved and demonstrated by the post treatment angiogram in all cases. There was no clinical complication after the treatment.

CONCLUSION

Onyx18 used is a safe treatment for DAVMs. When its injection is performed in optimal conditions, it fills the total DAVM and its drainage vein or sinus after a single arterial feeder catheterisation.

Clinical Outcome After First and Recurrent Hemorrhage in Patients With Untreated Brain Arteriovenous Malformation

Background and Purpose— The morbidity from spontaneous hemorrhage of untreated brain arteriovenous malformations (AVM) is not well described.

Methods— The 241 consecutive AVM patients (mean age 37±16 years, 52% women) from the prospective Columbia AVM Databank initially presenting with hemorrhage were evaluated using the Rankin Scale (RS) and the National Institute of Health Stroke Scale (NIHSS). From the 241 AVM patients, 29 (12%) had subsequent intracranial hemorrhage during follow-up. For further comparisons, 84 non-AVM patients with intracerebral hemorrhage from the Northern Manhattan Study (NOMAS) served as a control group.

Results— In 241 AVM patients presenting with hemorrhage the median RS was 2 and the median NIHSS was 1 (49% RS 0 to 1, 61% NIHSS <2). The median time between hemorrhage and clinical evaluation was 11 days (mean 219 days). Recurrent AVM hemorrhage during follow-up resulted in no significant increase in morbidity (median RS 2, P =0.004; median NIHSS 3, P =0.322; time between hemorrhage and study evaluation: median 55 days, mean 657 days). Among AVM-hemorrhage subtypes, parenchymatous AVM hemorrhage was associated with higher stroke morbidity (odds ratio, 2.9; 95% CI, 1.5 to 5.8 for NIHSS ≥2) than nonparenchymatous hemorrhages. Parenchymatous AVM hemorrhage had a significantly better outcome (median NIHSS 1) than non-AVM related hemorrhage (median NIHSS 12; P <0.0001).

Conclusions— Hemorrhage, either at initial presentation or during follow-up of untreated AVM patients appears to carry a lower morbidity than intracranial hemorrhage from other causes. These findings support a careful weighing of risks from interventional treatment and natural history.

Endovascular Treatment of Cerebral Arteriovenous Malformations

The modern management of cerebral arteriovenous malformations (AVMs) is based on three therapeutic modalities: microneurosurgery, endovascular embolization, and stereotactic radiosurgery. Embolization facilitates subsequent radiosurgery by reducing the volume of the nidus, prepares the resection of surgically accessible AVMs, and immediately addresses the risks related to associated intra/extranidal aneurysms and arteriovenous fistulas. We discuss in this article the current state of AVM endovascular therapy.