Cellular Angiofibroma of Oral Mucosa: Report of Two Cases

Cellular angiofibroma is a benign vascular neoplasm that typically arises in the vulva, perineal, and paratesticular region. Microscopically the lesions exhibit multiple small, non-dilated capillary channels, many of which contain erythrocytes. The endothelial lining cells are prominent, with monomorphic oval nuclei. Interposed among the vessels are both delicate and mature collagen fibers with fibroblastic hypercellularity that is variable in older lesions where sclerosis is prominent. The lesions usually do not recur following simple excision. Recent evidence indicates that cellular angiofibromas may be cytogenetically related to spindle cell lipoma. This represents the first reported instances of cellular angiofibroma in the oral cavity

Diamond formation by thermal activation of graphite

Synthetic diamond is used in applications ranging from abrasives, tool coatings, bearing surfaces, microelectronics and optics to techniques to produce diamond as the thermodynamically stable form(3), but it can also be grown at low pressures as a metastable carbon phase(1,2). Here we report the production of high-purity cubic diamond microparticles (10-100 mu m), which form in a highly concentrated carbon-vapour phase, followed by deposition of the crystals on the substrate, The carbon-vapour phase is generated by thermal activation of graphite, and the fast initial growth-rates of diamond, in the range 100-500 mu m s(-1), are at least two orders of magnitude higher than previously reported(1,2). We expect that tuning of experimental parameters to optimize the density of the carbon-vapour phase will allow us to grow larger diamond crystals, thereby opening a wider range of potential practical applications