1,721,044 research outputs found
Stabilizzazione vertebrale lombare ibrida con il sitema DTO®. Esperienza preliminare in 20 casi
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Operative case of Langerhans'cell histiocytosis of the skull with dural invasion. An immunohystochemical study of ki-67 expression of eosinophilic granuloma: case report and review of the literature
No full textEosinophilic granuloma (EG), Letterer-Siwe disease and Hand-Schuller-Christian disease are collectively called Langherans-cell histiocytosis (LCH). While the latter two are systemic diseases, the former is a localized form of histiocytosis. Solitary EG of the skull are rare lesions characterized by a natural history not well defined yet. In this context, we report a case of a 23-year-old male suffering for a recurrent and progressive right parietal headache. On computed tomography (CT) it was observed an ostelytic lesion which on magnetic resonance imaging (MRI) appeared as an hyperintense soft mass on both T1 and T2 weighted images. The lesion showed a marked and heterogeneous enhancement after gadolinium administration. The surgical excision was complete and the severe headache disappeared. Immunohistochemical analysis of the specimen indicated an eosinophilic granuloma characterized by Ki-67 nuclear antigen expression with a labeling index of 20%. In the pertinent literature we have found two aggressive cases of EG showing the Ki-67 expression with a respectively 6.2% (occipital bone granuloma) and 10% (parietal bone granuloma) labeling index. That high proliferative activity suggests a local Langherans' cell proliferation along with an exuberant inflammatory response and also explains the aggressive clinical course and the rapid expansion of the lesion observed in some rare cases of solitary EG. This is the third case-report of calvarial EG characterized by Ki-67 nuclear antigen expression
Idrocefalo "normoteso" dell'adulto. Previsione dei risultati nel trattamento chirurgico in 50 pazienti
No full textAn unruptured aneurysm of the posterior inferior cerebellar artery presenting with meningitis
No full textWe report a rare case of unruptured intracranial aneurysm presenting with meningitis. The patient showed symptoms and signs of meningitis without focal neurological deficit. A large PICA aneurysm compressing the medulla was diagnosed. The aneurysm was successfully clipped with remodeling of the parent artery, and the patient had an excellent recovery.
Meningitic presentation of an unruptured aneurysmis unusual and may be misleading. On the basis of histopathological and clinical findings, we hypothesized a secondary infection of a berry aneurysm. Aggressive microsurgical strategy resulted in complete occlusion of the aneurysm and parent vessel preservation with brainstem relief and excellent outcome
Cyst collapse in syringomyelia may continue for years after posterior fossa surgery. Report of 2 cases
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Artrodesi intersomatica cervicale con cages in tantalio: caratteristiche del materiale e risultati chirurgici
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