T^NIA EOHINOCOCOUS. 273 



CHAPTER VIII. 



TMmA EOHINOCOCOUS. 



Hydatids considered from a professional point of view — Leuckart's condensed account 

 of Virctow's so-called multUociilar Eohinocoocus-growtli — Its resemblance to 

 alveolar colloid — Relative frequency of hydatids in particular organs — Eesults 

 obtained by Rokitansky and Davaine — Cases recorded ia English periodicals — 

 Statistics — Statements of Krabbe and Schleisner — Diagnosis and treatment — 

 Prevention. 



Feom wliat .has been already advanced, it is evident that the pa- 

 thologist must be prepared to find a great variety of echinococcus 

 hydatid forms in the human subject. He may encounter the soli- 

 tary hydatid with its contained scolices, or a series of hydatids 

 more or less widely separated from each other by intervening 

 parenchyma. More commonly, he will meet with the endogenous 

 multiple form, the original maternal cyst containing, it may be, 

 only a few daughter vesicles, perhaps several score, possibly many 

 hundred, in which latter case part of them will commonly include 

 grand-daughter vesicles. Sometimes the secondary hydatids will 

 develop scolices and grand-daughter vesicles before the original 

 maternal hydatid has acquired echinococcus heads. In other words, 

 the progeny of the maternal hydatid may arrive at maturity be- 

 fore the mother itself. Leuckart has seen this, and he has also 

 seen instances where the daughter vesicles contained grand-daughter 

 hydatids, although the former were only half an inch in diameter. 



In addition to the above-mentioned kinds, one may occasion- 

 ally, though rarely, come across the multilocular form of echino- 

 coccus, whose true nature was first, described by Virchow. The 

 English pathologist is already, familiar . with the characters of this 



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