Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 ACTINOMYCOSIS. 679 incision exhibit a lardaceous appearance. On section it may appear that the lesion is confined entirely to the bone, though this is excep- tional (Fig. 274). Ordinarily the neighbouring tissues are also de- stroyed, and not infrequently there is communication with the ex- ternal air. Sections then display a fungoid tissue, interspersed with perforated lamella of bone and lardaceous tissue containing cavities crammed with actinomyces. The lesions in the parotid regi
Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 ACTINOMYCOSIS. 679 incision exhibit a lardaceous appearance. On section it may appear that the lesion is confined entirely to the bone, though this is excep- tional (Fig. 274). Ordinarily the neighbouring tissues are also de- stroyed, and not infrequently there is communication with the ex- ternal air. Sections then display a fungoid tissue, interspersed with perforated lamella of bone and lardaceous tissue containing cavities crammed with actinomyces. The lesions in the parotid regions, the neck or other parts attacked always present the same appearance, viz., wide, tortuous, bifurcated fistula;, with exuberant granulations both in the direction of the cavi- ties and of the exterior, together with lardaceous induration of the tissues and abundant foetid liquid pus. When it affects the tongue the parasite is to be found in the sub- mucous region, where it causes little swellings, which, when super- ficial, rapidl} undergo ulceration. The subjacent regions, the inter- stitial connective tissue, and the muscular tissue become infiltrated, hardened and progressively scle- rosed. The tongue is gradually hypertrophied, and soon it becomes as hard as wood, whence the term ' wooden tongue.' Actinomycosis of the lung may easily be mistaken for tuber- culosis, for the centres, although usually confined to one lobe, may also be disseminated. The lesions, however, are surrounded by an abundant fibro-sclerous inflammatory tissue. In the abdominal cavity, particularly in sows, actinomycotic lesions occur as little masses varying in size between that of a pea and that of a haricot bean, attached to the epiploon and peritoneum and filled with pus containing mycosic grains. Diagnosis. Actinomycosis is usually easy to recognise, both on account of the special character of the lesions and the presence of the little grains formed by the parasite. The practitioner will rarely
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