1,721,035 research outputs found
Computed tomography myelography for the assessment of iatrogenic cerebrospinal fluid (CSF) leak.
No full textPeriurethral glomangiomyoma in women: case report and review of the literature
Full text linkThe finding of a glomus tumour in sites so unusual, as in the case we describe, may requires distinction from other tumours including haemangiopericytoma because of the arrangement of tumour cells around the many branching vessels. However glomus cells are generally closely packed and more consistently round or polygonal. Immunocytochemical analysis resolves the differential diagnosis because the glomus cells contain considerable amounts of smooth muscle myofilaments that give positive immunostaining for smooth-muscle actin. Haemangiopericytoma cells rarely contain myofilaments and actin immunoreactivity is seen in only rare cases and, when present, is usually focal and weak. Another lesion that might be considered in the histological differential diagnosis is glomangiopericytoma characterized by histological features that are intermediate between glomus tumour and haemangiopericytoma such as prominent branching, medium and small vessels lined by a single row of endothelial cells, surrounded by epithelioid cells with a glomoid appearance
Cavernous sinus thrombosis associated with intraparenchymal hemorrhage and brainstem venous infarction as a rare complication of fronto-orbital infection
No full text
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
- …
