COMPOUND HISTIOID TUMOURS. 179 



h. Coinpound JSistioid Turnout's. 



§ 146. In all the histioid tumours which we have hitherto 

 examined, a single tissue could, with more or less of certainty 

 be viewed as the dominant constituent, thus enabling us to decide 

 on the character of the growth, and to give it an appropriate 

 name. There can be no doubt however that compound tumours 

 exist as well. When distinctly cartilaginous elements are found 

 associated with lipomatous ones, when sarcomatous nodules 

 ^re found (see above) scattered through an enchondroma, we are 

 puzzled whether to call these things enchondroma lipomatodes 

 or lipoma cartilagineum — sarcoma cartilagineum or chondroma 

 sarcomatosum. This perplexity recurs when we come to inquire 

 into the clinical character, prognosis, &c., of such tumours. As 

 regards the latter question, we are justified in laying down the 

 following propositions on the basis of several reliable observa- 

 tions ; 1st, that the prognosis of compound tumours is less 

 favourable than that of the seveial species of which they are 

 made up; 2nd, that the presence of sarcomatous constituents 

 renders a compound tumour at once equivalent to a sarcoma. A 

 <jompound tumour of this sort usually shows its true colours by 

 recurring as a sarcoma after its first extirpation. (For the com- 

 bination of histioid growths with carcinoma, see under the head 

 of Carcinoma Sarcomatosum.) 



4. ]\IoRBiD Growths due to Abnormalities of Epithelial 

 Development, whether involving the conjoint Blood- 

 vascular AND Connective-tissue System or not. 



§ 147. The present section will be mainly devoted to the 

 enunciation of some general views concerning the essential 

 nature, the mode of origin, and the affinities, of the so-called 

 ^* carcinomata." By carcinoma we understand a morbid growth 

 which exerts a destructive action upon the organs of the body, 

 which usually recurs after extirpation and gives rise to secondary 

 deposits, and which is therefore of a malignant nature. These 

 properties indeed, as we have seen already, are likewise exhibited 

 by certain histioid tumours, and it would be exceedingly desir- 

 able to have some definite anatomical criterion, by which we 

 might recognise carcinoma as such, and distinguish it from other 



