Introduction The Neuroform Atlas Stent System is a recently introduced modification of the original Neuroform Stent System consisting of a hybrid design with open and closed cells. Initial experience, technical considerations and treatment outcomes including 1-year follow-up using the Atlas stent in combination with coil embolization are reported. Material and methods Thirty patients with 30 unruptured aneurysms were treated with stent reconstruction. Immediate, 4-month and 12-month post-treatment angiography and clinical assessment were performed. Discussion In 29 cases, the stents were delivered and positioned without difficulty in deployment. Technical complications occurred in one patient related to advancement of the stent during delivery. One procedure-related clinical complication occurred with no permanent neurological deficit. On immediate post-treatment angiography, 29 of 30 aneurysms showed Raymond Class I or Class II occlusion. At 1-year follow-up, all 30 patients were clinically stable and 18 of 30 aneurysms showed Raymond Class I complete occlusion. Retreatment was performed in two patients with residual aneurysm. Conclusions The Atlas stent is technically safe and simple to implant and has a low thrombogenic potential. We experienced fewer problems associated with deployment and implantation, thromboembolic complications and hemorrhagic events compared with other types of stents, including braided stents. However, because of its low thrombogenic potential, partially occluded aneurysms or those with aneurysm remnants do not progress to complete occlusion.

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Epithelioid haemangioendothelioma (EHE) is a rare low-grade vascular neoplasm that is composed of mostly epithelioid cells. EHE may arise as a solitary tumour or in the form of multiple body lesions, and commonly occurs in soft tissues, liver, pleura, lung, peritoneum, lymph nodes, breast, and many other sites. EHE in the cranionasal region is extremely rare. There are very few reports of cases of skull-base EHE. We discuss an extremely rare presentation of an aggressive EHE that originated from the sellar region. Based on literature review, our patient is the first reported case of a giant solitary EHE with prepontine cistern invasion and abducens nerve encroachment mimicking a chondrosarcoma. We treated this rare tumour by near subtotal surgical excision with subsequent radiotherapy, considering that complete tumour resection with free margins in both cavernous sinus and clival region avoiding neural and vascular structure encroachment becomes technically difficult.

Aim of the studyRosette-forming glioneuronal tumour (RGNT) of the fourth ventricle is an uncommon tumour. The management is not consensual. Most of the published cases show stable outcome with and without gross total resection and are regarded as having a relatively indolent behaviour.Material and methodsWe present a 32-year-old man with a tumour in the fourth ventricle. He underwent midline suboccipital craniectomy with gross total removal.ResultsThe histopathological diagnosis was RGNT grade I. Four years later he presented a radiological progression and received stereotactic radiosurgery. At the last follow-up seven years after surgery, the MRI showed no recurrence.ConclusionsRGNT should be considered in the differential diagnosis of a posterior fossa tumour and has to be differentiated from other lesions for its indolent course and favourable prognosis. Surgical procedures should be carefully performed to avoid serious surgical morbidities. Stereotactic radiosurgery treatment appears to be a useful treatment in recurrence episodes.