TUMORS OF DOMESTIC ANIMALS 39 
class the hemorrhagic cysts, especially those occurring in the brain, 
amonsf the softening cysts. It must be remembered that some hem- 
orrhagic cysts may undergo regeneration instead of softening. 
SYNCYTIOMA 
Syncytioma (chorion carcinoma, chorioepithelioma. deciduoma, 
placentoma) is a malignant neoplasm, soft, friable, and spongy in 
structure, dark in color, generally containing blood clots. The neo- 
plasm resembles placental tissue in appearance and structure. It 
originates during or after pregnancy and sometimes follows abor- 
tion. Eecent observations have shown that it may be the result 
of teratomatous or embryomatous growth, as it has been found as 
testicular teratoma or embryoma. also as a mediastinal and cranial 
teratoma. The neoplasm is most malignant and generally gives 
metastasis to the external genitalia and less frequently to the liver, 
kidney, spleen, or other organs. 
Syncytioma has not been described in domestic animals. 
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