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They are met with chiefly on the palmar aspect of the fingers, and vary in size from a split pea to a cherry. The treatment consists in removing them by dissection. Parasitic cysts are produced by the growth within the tissues of cyst-forming parasites, the best known being the tænia echinococcus, which gives rise to the hydatid cyst.
His patient was a man of thirty-eight, a victim of hydatid disease of the liver, from whom he withdrew one gallon of offensive material. Lieutaud cites a case, reported by Blanchard, in which, in a case of hydatid disease, the stomach contained 90 pounds of fluid. Ankylosis of the articulations, a rare and curious anomaly, has been seen in the human fetus by Richaud, Joulin, Bird, and Becourt.
The clinical features of hydatids vary so much with their situation and size, that they are best discussed with the individual organs. In general it may be said that there is a slow formation of a globular, elastic, fluctuating, painless swelling. Fluctuation is detected when the cyst approaches the surface, and it is then also that percussion may elicit the "hydatid thrill" or fremitus.
These slightly combined and easily decomponible stuffs are as incapable of subsisting under the altered conditions of the earth as an hydatid in the blaze of a tropical sun. They would be no longer 'media' of communion between the man and his circumstances. A heavy difficulty presses, as it appears to me, on Lacunza's system, as soon as we come to consider the general resurrection.
#Cysts of Bone.# With the exception of hydatid cysts, cysts in the interior of bone are the result of the liquefaction of solid tissue; this may be that of chondroma, myeloma, or sarcoma, but more commonly of the marrow in osteomyelitis fibrosa. Definition of terms Ankylosis.
Castro and Vidal speak of worms in the aorta. Rake reports a case of sudden death from round-worm; and Brown has noted a similar instance. The echinococcus is a tiny cestode which is the factor in the production of the well-known hydatid cysts which may be found in any part of the body. Delafield and Prudden report the only instance of multilocular echinococcus seen in this country.
The liver is by far the most common site of hydatid cysts in the human subject. With regard to the further life-history of hydatids, the living elements of the cyst may die and degenerate, or the cyst may increase in size until it ruptures. As a result of pyogenic infection the cyst may be converted into an abscess.
The pig, in its domestic state, is subject to the attacks of a hydatid, from which the wild animal is free; hence the disease called measles in pork. The domestication of the pig is of course an event subsequent to the origin of man; indeed, comparatively speaking, a recent event. Whence, then, the first progenitor of this hydatid?
A rarer variety is the ossifying chondro-sarcoma, which undergoes ossification to such an extent as to be visible in skiagrams. In primary sarcoma the treatment consists in removing the muscle. In the limbs, the function of the muscle that is removed may be retained by transplanting an adjacent muscle in its place. Hydatid cysts of muscle resemble those developing in other tissues.
Pfeiler, who has worked at the serum diagnosis of hydatid disease, regards the complement deviation method as the most reliable; he believes that a positive reaction may almost be regarded as absolutely diagnostic of an echinococcal lesion.
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