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Histological examination allowed the observation of abcesses in several areas. A central zone with neutrophil granulocytes and necrotic tissue is surrounded by a band of fibrous connective tissue that constitutes the abscess capsule, showing the plugs of Actinomyces (A – hematoxylin and eosin, magnification 5×). At higher magnification, filamentous structures corresponding to aggregates of Actinomyces were identified (B and C – PAS 5× and 40× magnification respectively).
