MORBID ANATONY 



309 



nomycotic growth within, its diameter is being increased by 

 the deposition of new tissue until it may become several times 

 its normal size. 



The lesions spread in most cases by gradual invasion of 

 the tissues surrounding the infected point. At the seat of 

 infection, minute, inflammatory points appear, which extend at 

 their periphery and unite to form larger areas of diseased 

 tissue. These masses tend to extend in one direction and to 

 heal in another, leaving behind bands of cicatricial tissue. 



Fig. 76. Actinomycosis of the upper ja-iLi. {Photographed by Hopkins). 



The process usually differs widely from that of a simple 

 inflammation. In its progress the disease shows no preference 

 for structures but invades one tissue after another so that all 

 may be involved alike. 



The lymphatics show no constant tendency to become 

 involved. Metastasis occurs in a very small proportion of the 

 cases. When it does, as reported by Ponfick, large areas may 

 be simultaneously affected. He reports a case in the human 



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