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[Arterio-veinous malformations located within the occipito-cerebello-mesencephalic dihedral (author's transl)]
Insights
This study details 4 cases of arterio-venous malformations in the occipito-cerebello-mesencephalic region. Surgical intervention, particularly the posterior inter-occipital approach, offers improved outcomes for these complex vascular lesions.
Area of Science:
- Neurosurgery
- Vascular Neurology
- Neuroradiology
Background:
- Arterio-venous malformations (AVMs) in the occipito-cerebello-mesencephalic region are rare and present significant surgical challenges.
- This region includes critical structures such as the cistern of Galen, quadrigeminal bodies, splenium of the corpus callosum, cerebellum, and superior cerebellar peduncle.
Observation:
- Four cases of AVMs in this specific brain region were analyzed.
- Clinical presentations included headache, subarachnoid hemorrhage, impaired consciousness, cranial nerve deficits, nystagmus, motor impairment, cerebellar dysfunction, and hydrocephalus.
- Diagnostic modalities like angiography, ventriculography, and CT scans were evaluated for their utility.
Findings:
- Surgical treatment was pursued for all patients, aiming to improve their prognosis.
- The posterior inter-occipital surgical approach was favored over the sub-temporal route for better lesion visualization and management.
- Post-operative visual deficits occurred in all patients. Follow-up angiography showed complete AVM resolution in two patients and residual malformations in the other two.
Implications:
- Surgical management of occipito-cerebello-mesencephalic AVMs can be effective, though associated with risks such as visual disturbances.
- The posterior inter-occipital approach may offer advantages for surgical access and treatment of these complex AVMs.
- Further research is warranted to optimize surgical techniques and minimize post-operative complications for AVMs in this critical brain area.
Abstract:
About 4 cases of arterio-veinous malformations located within the occipito-cerebello-mesencephalic dihedral (which is this region of the brain including the cistern of Galen and the surrounding formations : the quadrigeminal bodies forwards, the splenium of the corpus callosum upwards, the upper face of the cerebellum and the pedonculus cerebellaris superior below) the authors related their own experience. These 4 cases are detailed from a clinical point of view. Them, a synthetic study is undertaken in which a comparison is done between the literature and the clinical features encountered : headache, sub-archnoid hemorrhage, impairment of consciousness, clinical features such as cranial nerve impairment, nystagmus motor impairment, cerebellar deficit, hydrocephaly. The value of angiography, ventriculography and CAT is discussed. All these patients have been operated upon as far as the authors think that a better chance can thus be offered to them. The choice of the technique is discussed. For one patient, the sub-temporal route was performed ; but it seems worth using the posterior inter-occipital route : this allows a better view on the lesion and an easier treatment of the malformation. These 4 patients suffered post operatively of a visual defect. The control angiography revealed no more arterio-venious malformation in two patients, a mild one in two others.