. Tumours, innocent and malignant; their clinical characters and appropriate treatment. Fig. 214.—Laloo, a Hindoo, with an acardiac parasite attached to his thorax. In the common form the shapeless mass is connected withthe dorsal aspect of the sacrum, and simulates a spina bifidasac, or the form of congenital sacro-coccygeal tumour whicharises in the postanal gut. These sacral teratomas oftentwitch when irritated, and this is a valuable diasrnostic rarer cases teratomas have been observed in the thoracicand abdominal cavities connected with the vertebral column. 430 TERATOMAS They ar
. Tumours, innocent and malignant; their clinical characters and appropriate treatment. Fig. 214.—Laloo, a Hindoo, with an acardiac parasite attached to his thorax. In the common form the shapeless mass is connected withthe dorsal aspect of the sacrum, and simulates a spina bifidasac, or the form of congenital sacro-coccygeal tumour whicharises in the postanal gut. These sacral teratomas oftentwitch when irritated, and this is a valuable diasrnostic rarer cases teratomas have been observed in the thoracicand abdominal cavities connected with the vertebral column. 430 TERATOMAS They are not uncommon on the head, particularly in relationwith the jaws (p. 435). The explanation of acardiac foetuses, whether free or para-sitic, seems to be this: Two embryos arise from a singleovum ; in some instances the cleavage is complete, but theheart of one embryo is defective. The circulation of the twoembryos is continuous at the placenta, and the heart of thenormal embryo is able to maintain in a measure the blood-current in its companion, and thus save it from complete. Placenta of theacardiac. Artery and vein dis-tributing blood tothe acardiac. Umbilical cord of the healtliytwin. Fig. 215.—Placenta from twins, one of which was an acardiac. (After Astley Cooper.) suppression. Sir Astley Cooper demonstrated this compen-satory mechanism in the case of an acardiacus placed in hishands by Dr. Hodgkin. An inspection of the drawing of theplacenta from this case (Fig. 215) shows that the umbilicalvessels in the two sections of the compound placenta weredirectly continuous. In the case of a parasitic acardiac— Laloo—the circula-tion must be directly maintained by the heart of the autosite,as an independent heart has not, so far as I am aware, beendetected in the parasite. The blood-current is always ex-tremely sloAV in the acardiac, and thermometric observations FAEASITIG FCETUS 431 demonstrate that its temperature is several degrees lower thanthat of the autosite.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectneoplasms, bookyear19
