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  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructural finding of vascular degeneration in myositis ossificans circumscripta (fibrodysplasia ossificans) (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 22 (1993), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A case of myositis ossificans circumscripta (fibrodysplasia ossificans) of the masseter muscle has been studied ultrastructurally. It showed atrophy of muscle fibres with deranged myofilaments, adjacent to dense fibrous tissue, osteoid and bone. A large number of the cells found in the dense fibrous tissue showed vacuolation and separation of membrane bound vesicles similar to matrix vesicles released by chondroblasts and osteoblasts during calcification. It is possible that, as in normal calcification of bone, these vesicles are responsible for initiating calcification in the ectopic bone found in the present condition. It was also shown that most of the blood vessel found in the blocks examined exhibited various degrees of degenerative changes. The finding of arterial occlusion together with capillary degeneration suggests that the main changes in myositis ossificans circumscripta may be those affecting blood vessels leading to ischaemic muscle atrophy. The fibrosis and ossification that follow are probably secondary changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0714.1993.tb00136.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Vascular degeneration in adenomatoid odontogenic tumour: an ultrastructural study (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 17 (1988), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The blood vessels in 3 cases of adenomatoid odontogenic tumour (AOT) were investigated ultrastructurally. An estimated 70–90% of the blood vessels found in the stroma showed degenerative changes which affected both the endothelial lining and the perivascular connective tissue. These vessels showed multiplication of basal lamina and were also encircled by concentric lamellae consisting either of collagen or fine filaments measuring 5–15 nm in diameter. Degradation of the layered collagen into fine filaments similar to those forming the concentric layers was observed. The present results suggest that the fine filaments of the concentric lamellae probably result from degradation of the layered collagen surrounding these vessels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0714.1988.tb01540.x
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    An ultrastructural study of binucleate plasma cells (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 15 (1986), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Fifty surgical specimens from 10 different diseases were examined for the presence of binucleate plasma cells. Thirty-three specimens showed binucleated plasma cells. Morphologically, they resembled mononuclear cells and contained abundant basophilic cytoplasm which ultra-structurally showed extensive rough endoplasmic reticulum. Their 2 nuclei exhibited the “cart-wheel” arrangement of heterochromatin characteristic of plasma cells. When serially examined the 2 nuclei remained separate. In addition, pairs of closely apposed plasma cells were observed. Some of these cells showed distinct opposing membranes separated by a gap of approximately 15nm. While others, exhibited localised areas of indistinct membranes. There were also pairs of closely apposed plasma cells showing cytoplasmic bridges. These results suggest that the mode of formation of binucleate plasma cells is probably cell fusion. They also show that these binucleate cells are not confined to a single disease as they were found in 10 different diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0714.1986.tb00589.x
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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