Abstract
A pathological observation was conducted on echinococcosis of tl?ree cows, which hadbeen kept in Morioka City and its vicinit)z for" several years. lhcse cows, consisting oftwo Jerseys and one Aberdeen-Angus, were considered to have been imported from NCXX7Zealand and Australia. ?.[hey were slaughtered itn 1964, 1965 and 1966. Hydatid cystswere detected at the abattoirs during the routine meat inspection. These were presentin the lungs and livers of all the cows ar?d in the spleen of a Jersey covv (Fig. l I, Table l).Macroscopically, these cysts existed in the parenchymatous tisstucs, were as large asrice-grain to walnut, in size attd presented a globular appear;rnce. llte inner surfacesof the cysts were even, except some of them wl?ich h?td irregttlztr ;tnd p;trtition-likeprocesses. Yellovvislt clear liquid flowed out when the cysts were cut (INigs. l -3). Cystsrelatively small in size contained yellowish white caseous suLcstance and turlcid liquid.The caseous substance was proved to be a single cuticular membrane foldcd in pile inone cyst (Fig. 4). No hydatid sand was detected in the liquid.Histologically, the wall of the large-sized cyst showed the typical at"rangernent of awell-known Echinococcus cyst ; i.e., cuticular tnembrane, germinal 1;tyer, fibrous tissuelayer, and cellular infiltration (Fig. 5).The small degenerated cyst contained a folded cuticular membrane. As a z"esult ofthe process of degeneration, cellular debris accumulated under the membrane and slougltedoff the germinal layer. When no enlargement was caused in tl?e cyst, the foldedcuticular membrane which had sloughed filled the cystic space, vvherc the forrnation ofcuticle still contiuned in the other portion of the germinal layer. Calcification becamealso to be observed in tlte debris (Figs. 6 - 10).From these morplnological findings, tI?e exa?nined cases xxet"e diagnosed as those of" ttnilocular sterile (degenerated) type."It has raised serious problems in many fields that Echinococcus granulosus was detectedfrom such disease-fr
