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• W2912456518 abstract "Although Actinomyces israelii, the chief etiological agent of human actinomycosis, is a common saprophyte of the oral cavity, periapical actinomycosis is believed to be extremely rare. A recent survey of the literature revealed only 20 cases on record. The purpose of this communication is to document two additional cases and to describe them using light and transmission electron microscopy. Of a total of 45 human spontaneous periapical lesions examined, 2 revealed distinct actinomycotic involvement. Typical “ray fungus” colonies with radiating peripheral filaments could be observed in both specimens. However, in one specimen the colonies were restricted to the apical root canal, but in the other a typical actinomycotic rosette could be observed within the body of the apical granuloma. A few layers of polymorphonuclear leukocytes surrounded the colonies, many of them containing phagocytosed bacteria. Both granulomas contained a mixed infiltrate of mononuclear and polymorphonuclear leukocytes. Although Actinomyces israelii, the chief etiological agent of human actinomycosis, is a common saprophyte of the oral cavity, periapical actinomycosis is believed to be extremely rare. A recent survey of the literature revealed only 20 cases on record. The purpose of this communication is to document two additional cases and to describe them using light and transmission electron microscopy. Of a total of 45 human spontaneous periapical lesions examined, 2 revealed distinct actinomycotic involvement. Typical “ray fungus” colonies with radiating peripheral filaments could be observed in both specimens. However, in one specimen the colonies were restricted to the apical root canal, but in the other a typical actinomycotic rosette could be observed within the body of the apical granuloma. A few layers of polymorphonuclear leukocytes surrounded the colonies, many of them containing phagocytosed bacteria. Both granulomas contained a mixed infiltrate of mononuclear and polymorphonuclear leukocytes. A pesar de que el Actinomices israeli, agente etiológico principal de la actinomicosis humana, es un saprófito común de la cavidad oral, la actinomicosis periapical se considera extremadamente rara. Un estudio reciente de la literatura reveló solamente 20 casos registrados. El propósito de esta comunicación es documentar dos casos más y describirlos usando microscopio común y de transmisión electrónica. De 45 lesiones periapicales espontáneas humanas examinadas, dos revelaron presencia actinomicótica. En ambos casos se pudo observar típicas colonias de “hongos radiados” con filamentos periféricos radiales. Sin embargo, en un caso las colonias estaban presentes solamente en la parte o tercio apical del conducto, mientras que en el otro se pudo observar una roseta actinomicótica típica dentro de la masa del granuloma apical. Unas pocas capas de leucocitos polimorfonucleares (PMN) rodeaban las colonias, muchos de ellos conteniendo bacterias fagocitadas. Ambos granulomas presentaban un infiltrado mixto de leucocitos mono y polimorfonucleares. A pesar de que el Actinomices israeli, agente etiológico principal de la actinomicosis humana, es un saprófito común de la cavidad oral, la actinomicosis periapical se considera extremadamente rara. Un estudio reciente de la literatura reveló solamente 20 casos registrados. El propósito de esta comunicación es documentar dos casos más y describirlos usando microscopio común y de transmisión electrónica. De 45 lesiones periapicales espontáneas humanas examinadas, dos revelaron presencia actinomicótica. En ambos casos se pudo observar típicas colonias de “hongos radiados” con filamentos periféricos radiales. Sin embargo, en un caso las colonias estaban presentes solamente en la parte o tercio apical del conducto, mientras que en el otro se pudo observar una roseta actinomicótica típica dentro de la masa del granuloma apical. Unas pocas capas de leucocitos polimorfonucleares (PMN) rodeaban las colonias, muchos de ellos conteniendo bacterias fagocitadas. Ambos granulomas presentaban un infiltrado mixto de leucocitos mono y polimorfonucleares." @default.
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• W2912456518 date "1984-12-01" @default.
• W2912456518 modified "2023-10-10" @default.
• W2912456518 title "Periapical actinomycosis" @default.
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• W2912456518 doi "https://doi.org/10.1016/s0099-2399(84)80102-8" @default.
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